Axinite sorosilicate silicates. . Great video
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Axinite is the common name for 4 kinds of minerals.
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axinite stone
From the group of silicates, a subgroup of sorosilicates. All of them are triclinic borosilicates with the formula: Ca2(Fe, Mg, Mn)Al2[BO3OH, Si4O12].
Discovered at the end of the XNUMXth century by Jean-Godefroy Schreiber. In Oisan, this naturalist is also indebted for the discovery of Stilbit and Anatas. The first description concerns the Rome de Lisle mineral. He was named René-Just Hayuy.
The word comes from the Greek axinè = axe. Because of the shape of the crystal. The name of the stone is associated with the location of the crystals. It takes a shape resembling an ax blade on the sides of the X. René-Just Haüy.
The stone structure consists of [Si4O12]8- and BO3 rings. Rings are bred parallel to each other. And almost parallel to the (010) plane. Iron in an octahedral position connects the groups there. Also aluminum in tetrahedral and octahedral coordination. And through calcium, which is in the center of an irregular polyhedron with 10 oxygenates.
Chemistry of axinite gemstones
An important point in the chemistry of this silicate is the presence of boron in large quantities. The percentage of calcium remains constant. However, iron, like manganese, can change in inverse proportions. The optical properties of a stone are closely related to the content of these three elements.
Forms {110}, {-110}, {1-11} have been developed. The faces are often slightly ribbed. And they form sharp corners, giving the mineral a sharp look.
Mineral metamorphic contact and metasomatism. Found in weathered limestone deposits. And also in altered basic igneous rocks subject to metamorphism with the introduction of boron.
In crystalline schists metamorphosed with granite.
We can find it with other calcium rich silicates as well as boron. Such as tourmalines, datolite, calcium amphibole, actinolite, zosite, calcite, and also quartz.
Group of axinite stones
- ferroaxinite, Ca2Fe2 + Al2BOSi4O15(OH) rich in iron, also carnation, brown, plum blue, pearl gray.
- magnesioaxinite, Ca2MgAl2BOSi4O15(OH), rich in magnesium, also light blue to light purple, light brown to light pink.
- manganaxinite, Ca2Mn2 + Al2BOSi4O15 (OH) rich in manganese, also honey yellow, clove brown, brown to blue.
- tinzenite, (CaFe2 + Mn2 +) 3Al2BOSi4O15 (OH) iron, also intermediate manganese, yellow, brownish yellow-green.
Axinite Crystal
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