Dachiardite-K is a rare

zeolite Zeolites are microporous, crystalline aluminosilicate materials commonly used as commercial adsorbents and catalysts. They mainly consist of silicon, aluminium, oxygen, and have the general formula ･y where is either a metal ion or H+. These pos ...

-group mineral with the formula K₄(Si₂₀Al₄O₄₈)•13H₂O.Chukanov, N.V., Encheva, S., Petrov, P., Pekov, I.V., Belakovskiy, D.I., Britvin, S.N., and Aksenov, S.M., 2015. Dachiardite-K, IMA 2015-041. CNMNC Newsletter No. 27, October 2015, 1224; Mineralogical Magazine 79, 1229–1236 It is the

potassium Potassium is the chemical element with the symbol K (from Neo-Latin ''kalium'') and atomic number19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. Potassium metal reacts rapidly with atmosphe ...

-analogue of dachiardite-Ca and dachiardite-Na, as suggested by the suffix "-K".

Occurrence and association

Dachiardite-K was discovered in

opal Opal is a hydrated amorphous form of silica (SiO2·''n''H2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms ...

- chalcedony

vein Veins are blood vessels in humans and most other animals that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated b ...

s in

Eastern Rhodopes The Rhodopes (; bg, Родопи, ; el, Ροδόπη, ''Rodopi''; tr, Rodoplar) are a mountain range in Southeastern Europe, and the largest by area in Bulgaria, with over 83% of its area in the southern part of the country and the remainder in ...

Bulgaria Bulgaria (; bg, България, Bǎlgariya), officially the Republic of Bulgaria,, ) is a country in Southeast Europe. It is situated on the eastern flank of the Balkans, and is bordered by Romania to the north, Serbia and North Macedon ...

. It is associated with

barite Baryte, barite or barytes ( or ) is a mineral consisting of barium sulfate ( Ba S O4). Baryte is generally white or colorless, and is the main source of the element barium. The ''baryte group'' consists of baryte, celestine (strontium sulfate), ...

calcite Calcite is a Carbonate minerals, carbonate mineral and the most stable Polymorphism (materials science), polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on ...

clinoptilolite Clinoptilolite is a natural zeolite composed of a microporous arrangement of silica and alumina tetrahedra. It has the complex formula . It forms as white, green to reddish tabular monoclinic tectosilicate crystals with a Mohs hardness of 3.5 to ...

-Ca, clinoptilolite-K,

celadonite Celadonite is a mica group mineral, a phyllosilicate of potassium, iron in both oxidation states, aluminium and hydroxide with formula . It crystallizes in the monoclinic system and usually forms massive aggregates of prismatic crystallites or in ...

, dachiardite-Ca, dachiardite-Na,

ferrierite The ferrierite group of zeolite minerals (the FER structure) consists of three very similar species: ferrierite- Mg, ferrierite- Na, and ferrierite- K, based on the dominant cation in the A location. ferrierite-Mg and ferrierite-K are orthorhombic ...

-K, ferrierite-Mg, ferrierite-Na,

mordenite Mordenite is a zeolite mineral with the chemical formula, ( Ca, Na2, K2) Al2 Si10 O24·7 H2O. and it is one of the six most abundant zeolites and is used commercially. It was first described in 1864 by Henry How. He named it after the small com ...

, and smectite.

References

Zeolites Tectosilicates Silicate minerals Potassium minerals Aluminium minerals Monoclinic minerals {{mineral-stub