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The borate minerals are minerals which contain a
borate A borate is any of several boron oxyanions, negative ions consisting of boron and oxygen, such as orthoborate , metaborate , or tetraborate ; or any salt with such anions, such as sodium metaborate, and disodium tetraborate . The name also ...
anion An ion () is an atom or molecule with a net electrical charge. The charge of an electron is considered to be negative by convention and this charge is equal and opposite to the charge of a proton, which is considered to be positive by conven ...
group. The borate (BO3) units may be polymerised similar to the SiO4 unit of the
silicate mineral Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of Earth's crust. In mineralogy, silica (silicon dioxide, ) is usually cons ...
class. This results in B2O5, B3O6, B2O4 anions as well as more complex structures which include
hydroxide Hydroxide is a diatomic anion with chemical formula OH−. It consists of an oxygen and hydrogen atom held together by a single covalent bond, and carries a negative electric charge. It is an important but usually minor constituent of water. It ...
or halogen anions.Klein, Cornelis and Cornelius Hurlbut, Jr., ''Manual of Mineralogy'', Wiley, 20th ed., 1985 pp. 343 - 347 The (O,OH)4sup>− anion exists as well. Many borate minerals, such as
borax Borax is a salt (ionic compound), a hydrated borate of sodium, with chemical formula often written . It is a colorless crystalline solid, that dissolves in water to make a basic solution. It is commonly available in powder or granular form ...
,
colemanite Colemanite (Ca2B6O11·5H2O) or (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite. It was first described in 18 ...
, and
ulexite Ulexite (NaCaB5O6(OH)6·5H2O, hydrated sodium calcium borate hydroxide), sometimes known as TV rock or Television stone, is a mineral occurring in silky white rounded crystalline masses or in parallel fibers. The natural fibers of ulexite conduc ...
, are
salts In chemistry, a salt is a chemical compound consisting of an ionic assembly of positively charged cations and negatively charged anions, which results in a compound with no net electric charge. A common example is table salt, with positively cha ...
: soft, readily soluble, and found in
evaporite An evaporite () is a water-soluble sedimentary mineral deposit that results from concentration and crystallization by evaporation from an aqueous solution. There are two types of evaporite deposits: marine, which can also be described as ocean ...
contexts. However, some, such as
boracite Boracite is a magnesium borate mineral with formula: Mg3 B7 O13 Cl. It occurs as blue green, colorless, gray, yellow to white crystals in the orthorhombic - pyramidal crystal system. Boracite also shows pseudo-isometric cubical and octahedral for ...
, are hard and resistant to weathering, more similar to the
silicates In chemistry, a silicate is any member of a family of polyatomic anions consisting of silicon and oxygen, usually with the general formula , where . The family includes orthosilicate (), metasilicate (), and pyrosilicate (, ). The name ...
. There are over 100 different borate minerals.Webmineral.Com
Strunz group V/G - V/L
Borate minerals include: *
Kernite Kernite, also known as rasorite, is a hydrated sodium borate hydroxide mineral with formula . It is a colorless to white mineral crystallizing in the monoclinic crystal system typically occurring as prismatic to acicular crystals or granular mass ...
Na2B4O6(OH)2·3H2O *
Borax Borax is a salt (ionic compound), a hydrated borate of sodium, with chemical formula often written . It is a colorless crystalline solid, that dissolves in water to make a basic solution. It is commonly available in powder or granular form ...
Na2B4O5(OH)4·8H2O *
Ulexite Ulexite (NaCaB5O6(OH)6·5H2O, hydrated sodium calcium borate hydroxide), sometimes known as TV rock or Television stone, is a mineral occurring in silky white rounded crystalline masses or in parallel fibers. The natural fibers of ulexite conduc ...
NaCaB5O6(OH)6·5H2O *
Colemanite Colemanite (Ca2B6O11·5H2O) or (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite. It was first described in 18 ...
CaB3O4(OH)3·H2O *
Boracite Boracite is a magnesium borate mineral with formula: Mg3 B7 O13 Cl. It occurs as blue green, colorless, gray, yellow to white crystals in the orthorhombic - pyramidal crystal system. Boracite also shows pseudo-isometric cubical and octahedral for ...
Mg3B7O13Cl *
Painite Painite is a very rare borate mineral. It was first found in Myanmar by British mineralogist and gem dealer Arthur C.D. Pain who misidentified it as ruby, until it was discovered as a new gemstone in the 1950s. When it was confirmed as a new miner ...
CaZrAl9O15(BO3)


Nickel–Strunz Classification -06- Borates

IMA-CNMNC proposes a new hierarchical scheme (Mills et al., 2009). This list uses it to modify the Classification of Nickel–Strunz (
mindat.org Mindat.org is a non-commercial online database, claiming to be the largest mineral database and mineralogical reference website on the Internet. It is used by professional mineralogists, geologists, and amateur mineral collectors alike. The ...
, 10 ed, pending publication). Note that although Nickel–Strunz division letters were traditionally based on the number of boron atoms in a mineral's chemical formula (06.A are monoborates, 06.B are diborates, etc.), the IMA has reclassified borate minerals based on the polymerisation of the borate anion. ;Abbreviations: * ''REE'': rare-earth element (Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu) * ''PGE'': platinum-group element (Ru, Rh, Pd, Os, Ir, Pt) * ''*'' : discredited (IMA/CNMNC status) * ''?'' : questionable/doubtful (IMA/CNMNC status) Regarding 03.C Aluminofluorides, 06 Borates, 08 Vanadates (04.H V ,6/sup> Vanadates), 09 Silicates: * ''neso-'': insular (from Greek , "island") * ''soro-'': grouped (from Greek , "heap, pile, mound") * ''cyclo-'': rings of (from Greek , "circle") * ''ino-'': chained (from Greek , "fibre",
rom Ancient Greek Rom, or ROM may refer to: Biomechanics and medicine * Risk of mortality, a medical classification to estimate the likelihood of death for a patient * Rupture of membranes, a term used during pregnancy to describe a rupture of the amniotic sac * R ...
* ''phyllo-'': sheets of (from Greek , "leaf") * ''tekto-'': three-dimensional framework (from Greek , "of building") ;Nickel–Strunz code scheme ''NN.XY.##x'': * ''NN'': Nickel–Strunz mineral class number * ''X'': Nickel–Strunz mineral division letter * ''Y'': Nickel–Strunz mineral family letter * ''##x'': Nickel–Strunz mineral/group number; ''x'' an add-on letter


Class: borates

* 06. Alfredstelznerite * 06.A Monoborates ** 06.AA BO3, without additional anions; 1(D): 05
Sassolite Sassolite is a borate mineral, specifically the mineral form of boric acid. It is usually white to gray, and colourless in transmitted light. It can also take on a yellow colour from sulfur impurities, or brown from iron oxides. History and occ ...
; 15 Nordenskioldine, 15
Tusionite Tusionite is a rare colorless to transparent to translucent yellow brown trigonal borate mineral with chemical formula: MnSn(BO3)2. The mineral is composed of 18.86% manganese, 40.76% tin, 7.42% boron, and 32.96% oxygen. It is a late stage hydro ...
; 35 Jimboite, 35 Kotoite; 40 Takedaite ** 06.AB BO3, with additional anions; 1(D) + OH, etc.: 05 Hambergite, 10 Berborite, 15
Jeremejevite Jeremejevite is an aluminium borate mineral with variable fluoride and hydroxide ions. Its chemical formula is . It is considered as one of the rarest, thus one of the most expensive stones. For nearly a century, it was considered as one of the r ...
; 20
Warwickite Warwickite is an iron magnesium titanium borate mineral with the chemical formula ''or'' . It occurs as brown to black prismatic orthorhombic crystals which are vitreous and transparent. It has a Mohs hardness of 3 to 4 and a specific gravity ...
, 20
Yuanfuliite Yuanfuliite is a black submetal mineral. The mineral is named after the geologist Yuan Fuli. It can be found in places like Russia, Sakha Republic, and Siberia Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) ...
; 25 Karlite; 30 Azoproite, 30
Bonaccordite Bonaccordite is a rare mineral discovered in 1974. Its chemical formula is Ni2FeBO5 and it is a mineral of the ludwigite group. It usually crystallizes in long, cylindrical prisms that form within another source. It is named after the area of Bo ...
, 30 Fredrikssonite, 30
Ludwigite Ludwigite is a magnesium-iron borate mineral: Mg2FeBO5. Ludwigite typically occurs in magnesian iron skarn and other high temperature contact metamorphic deposits. It occurs in association with magnetite, forsterite, clinohumite and the borate ...
, 30 Vonsenite; 35 Pinakiolite; 40 Blatterite, 40 Orthopinakiolite, 40 Takeuchiite, 40 Chestermanite; 45 Hulsite, 45 Magnesiohulsite, 45 Aluminomagnesiohulsite; 50 Hydroxylborite, 50
Fluoborite Fluoborite has a chemical formula of Mg3(BO3)(F,OH)3. Its name comes from its main chemical components, FLUOrine and BORon. It was first described in 1926. Fluoborite's crystal system is hexagonal, meaning it has one six-fold axis of rotation. It ...
; 55 Shabynite, 55 Wightmanite; 60 Gaudefroyite, 65 Sakhaite, 70 Harkerite; 75 IMA2008-060, 75 Pertsevite; 80 Jacquesdietrichite, 85
Painite Painite is a very rare borate mineral. It was first found in Myanmar by British mineralogist and gem dealer Arthur C.D. Pain who misidentified it as ruby, until it was discovered as a new gemstone in the 1950s. When it was confirmed as a new miner ...
** 06.AC B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc.: 05 Sinhalite; 10 Pseudosinhalite; 15
Béhierite Béhierite is a very rare mineral, a natural tantalum borate of the formula (Ta,Nb)BO4. Béhierite is also one of the most simple tantalum minerals. It contains simple tetrahedral borate anions, instead of more common among minerals, planar BO3 gro ...
, 15
Schiavinatoite Schiavinatoite is a very rare mineral, a natural niobium borate with the chemical formula .Demartin, F., Diella, V., Gramaccioli, C.M., and Pezzotta, F., 2001. Schiavinatoite, , the Nb analogue of behierite. European Journal of Mineralogy 13, 159-1 ...
; 20 Frolovite; 25
Hexahydroborite Hexahydroborite is a mineral composed of calcium, boron, oxygen, and hydrogen, with formula , more precisely . Hexahydroborite is the end member of a series of natural metaborates with the general formula or with ''n'' varying from 0 to 6, the o ...
; 30 Henmilite; 35 Bandylite; 40 Teepleite; 45 Moydite-(Y); 50 Carboborite; 55 Sulfoborite; 60 Luneburgite; 65 Seamanite; 70
Cahnite Cahnite (Cahnit in German, Cahnita in Spanish, Канит in Russian) is a brittle white or colorless mineral that has perfect cleavage and is usually transparent. It usually forms tetragonal-shaped crystals and it has a hardness of 3 mohs. Cahni ...
* 06.H Unclassified Borates ** 06.HA Unclassified borates: 05 Chelkarite; 10 Braitschite-(Ce); 15 Satimolite; 20 Iquiqueite; 25 Wardsmithite; 30 Korzhinskite; 35 Halurgite; 40 Ekaterinite; 45 Vitimite; 50 Canavesite; 55 Qilianshanite


Subclass: nesoborates

* 06.BA Neso-diborates with double triangles B2(O,OH)5; 2(2D); 2(2D) + OH, etc.: 05
Suanite Suanite is a magnesium borate mineral with formula Mg2B2O5. It was first described in 1953 by Japanese scientist Takeo Watanabe from the University of Tokyo. His first contact with the mineral was during analysis of gold- and copper- bearing ska ...
; 10 Clinokurchatovite, 10 Kurchatovite; 15 Sussexite, 15 Szaibelyite; 20 Wiserite * 06.BB Neso-diborates with double tetrahedra B2O(OH)6; 2(2T): 05 Pinnoite; 10 Pentahydroborite * 06.CA Neso-triborates: 10 Ameghinite; 15 Inderite; 20 Kurnakovite; 25 Inderborite; 30 Meyerhofferite; 35 Inyoite; 40 Solongoite; 45 Peprossiite-(Ce); 50 Nifontovite; 55 Olshanskyite * 06.DA Neso-tetraborates: 10
Borax Borax is a salt (ionic compound), a hydrated borate of sodium, with chemical formula often written . It is a colorless crystalline solid, that dissolves in water to make a basic solution. It is commonly available in powder or granular form ...
; 15
Tincalconite Tincalconite is a hydrous sodium borate mineral closely related to borax, and is a secondary mineral that forms as a dehydration product of borax. Its formula is Na2 B4 O7·5 H2O or Na2 hydrogen.html"_;"title="4O5(Ohydrogen">H)4�3H2O. Tincalconi ...
; 20 Hungchaoite; 25 Fedorovskite, 25 Roweite; 30 Hydrochlorborite; 35 Uralborite; 40 Numanoite, 40 Borcarite; 60
Fontarnauite Fontarnauite is a relatively recently described, rare sulfate, borate mineral with the chemical formula . It is found in an evaporite boron deposit. It coexists with other evaporite boron minerals, especially probertite. It is monoclinic, crystal ...
* 06.EA Neso-pentaborates: 05 Sborgite; 10 Ramanite-(Rb), 10 Ramanite-(Cs), 10 Santite; 15 Ammonioborite; 25
Ulexite Ulexite (NaCaB5O6(OH)6·5H2O, hydrated sodium calcium borate hydroxide), sometimes known as TV rock or Television stone, is a mineral occurring in silky white rounded crystalline masses or in parallel fibers. The natural fibers of ulexite conduc ...
* 06.FA Neso-hexaborates: 05 Aksaite; 10 Mcallisterite; 15
Admontite Admontite is a hydrated magnesium borate mineral with formula MgB6O10·7H2O. Occurrence - In a gypsum deposit. Associations: gypsum, anhydrite, hexahydrite, löweite, eugsterite, pyrite, quartz. It is named after Admont, Austria. Its Mohs ...
; 20 Rivadavite; 25 Teruggite


Subclass: inoborates

* 06.BC Ino-diborates with triangles and/or tetrahedra: 10 Calciborite, 10 Aldzhanite*; 15 Vimsite; 20 Sibirskite, 20 Parasibirskite * 06.CB Ino-triborates: 10
Colemanite Colemanite (Ca2B6O11·5H2O) or (CaB3O4(OH)3·H2O) is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite. It was first described in 18 ...
; 15 Hydroboracite; 20
Howlite Howlite, a calcium borosilicate hydroxide ( Ca2 B5 Si O9(O H)5), is a borate mineral found in evaporite deposits.
; 25 Jarandolite * 06.DB Ino-tetraborates: 05
Kernite Kernite, also known as rasorite, is a hydrated sodium borate hydroxide mineral with formula . It is a colorless to white mineral crystallizing in the monoclinic crystal system typically occurring as prismatic to acicular crystals or granular mass ...
* 06.EB Ino-pentaborates: 05 Larderellite; 10 Ezcurrite; 15 Probertite; 20 Tertschite; 25 Priceite * 06.FB Ino-hexaborates: 05 Aristarainite; 10 Kaliborite


Subclass: phylloborates

* 06.CC Phyllo-triborates: 05 Johachidolite * 06.EC Phyllo-pentaborates: 05 Biringuccite, 05 Nasinite; 10 Gowerite; 15
Veatchite Veatchite is an unusual strontium borate, with the chemical formula Sr2B11O16(OH)5·H2O. There are two known polytypes, veatchite-A and veatchite-p.Grice J D, Pring A (2012) Veatchite: structural relationships of the three polytypes, American Mine ...
, 15 Veatchite-A, 15 Veatchite-p; 20 Volkovskite; 25 Tuzlaite; 30 Heidornite; 35 Brianroulstonite * 06.FC Phyllo-hexaborates: 05 Nobleite, 05 Tunellite, 05 Balavinskite; 10 Strontioborite; 15 Ginorite, 15 Strontioginorite; 20 Fabianite * 06.GB Phyllo-nonaborates, etc.: 05 Studenitsite; 10 Penobsquisite; 15 Preobrazhenskite; 20 Walkerite


Subclass: tektoborates

* 06.BD Tektodiborates with tetrahedra: 05 Santarosaite * 06.DD Tekto-tetraborates: 05 Diomignite * 06.ED Tekto-pentaborates: 05 IMA2007-047, 05 Tyretskite, 05
Hilgardite Hilgardite is a borate mineral with the chemical formula Ca2B5O9Cl·H2O. It is transparent and has vitreous luster. It is colorless to light pink with a white streak. It is rated 5 on the Mohs Scale. It crystallizes in the triclinic crystal sy ...
, 05 Kurgantaite * 06.GA Tekto-heptaborates: 05
Boracite Boracite is a magnesium borate mineral with formula: Mg3 B7 O13 Cl. It occurs as blue green, colorless, gray, yellow to white crystals in the orthorhombic - pyramidal crystal system. Boracite also shows pseudo-isometric cubical and octahedral for ...
, 05
Chambersite Chambersite is a manganese borate mineral with formula . It is a member of the borate mineral seriesGrice ''et al.'', 2005 that includes other minerals such as ericaite () and boracite ().Yawn ''et al.'', 1997 When chambersite was first discovered ...
, 05 Ericaite; 10 Congolite, 10 Trembathite * 06.GC Tekto-dodecaborates: 05
Rhodizite The borate minerals are minerals which contain a borate anion group. The borate (BO3) units may be polymerised similar to the SiO4 unit of the silicate mineral class. This results in B2O5, B3O6, B2O4 anions as well as more complex structures whic ...
, 05 Londonite * 06.GD Mega-tektoborates: 05 Ruitenbergite, 05 Pringleite; 10 Metaborite


See also

* Classification of minerals - Non-silicates *
Classification of minerals - Silicates This list gives an overview of the classification of minerals (silicates) and includes mostly International Mineralogical Association (IMA) recognized minerals and its groupings. This list complements the List of minerals recognized by the Internat ...


References

* * * Hr. Dr. Udo Neumann der Uni-Tuebingen
Systematik der Minerale


External links

* {{Strunz