|
Magnesioaxinite
Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boron, boro-silicon, silicate, . Axinite is pyroelectricity, pyroelectric and piezoelectric. The axinite group includes: *Axinite-(Fe) or ferroaxinite, Ca2Fe2+Al2BOSi4O15(OH) iron rich, clove-brown, brown, plum-blue, pearl-gray *Axinite-(Mg) or magnesioaxinite, Ca2MgAl2BOSi4O15(OH) magnesium rich, pale blue to pale violet; light brown to light pink *Axinite-(Mn) or manganaxinite, Ca2Mn2+Al2BOSi4O15(OH) manganese rich, honey-yellow, clove-brown, brown to blue *Tinzenite, (CaFe2+Mn2+)3Al2BOSi4O15(OH) iron – manganese intermediate, yellow, brownish yellow-green Axinite is sometimes used as a gemstone.Tables of Gemstone Identification By Roger Dedeyne, Ivo Quintens p.147 Gallery File:Axinite-64246.jpg, Clove-brown axinite crystals to 2.3 cm set atop matrix from the West Bor Pit at Dalnegorsk, Russia File:Axinite-60191.jpg, Chloritized bladed crystals of Axinite forming ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Axinite-(Mg)
Axinite-(Mg) is a borosilicate mineral of aluminum, calcium and magnesium of the axinite group, with magnesium as the dominant cation in the place of the structure that can also be occupied by iron and manganese. It was discovered in gem material from Merelani Hills, Lelatema Mts, Manyara Region, Tanzania, which is consequently its type locality (geology), type locality. It was initially called magnesioaxinite, referring to its membership in the axinite group and the role of magnesium as the dominant cation. The International Mineralogical Association (IMA) later changed its name to axinite-(Mg). Occasionally it has been carved as a collection gem. Physical and chemical properties Like the rest of the minerals in the axinite group, axinite-(Mg) belongs to the triclinic system, appearing in the form of crystals with the characteristic ax-shaped morphology. Its structure can be described as a sequence of alternating layers of cations coordinated tetrahedrally and octahedrally. D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |