Axinite

sorosilicate

Axinite represents three minerals:
Axinite-(Fe) Ca2(Fe2+Al2BSi4O15(OH)
Axinite-(Mg) Ca2MgAl2BSi4O15(OH) and
Axinite-(Mn) Ca2(Mn2+Al2BSi4O15(OH)
All of these are sorosilicates (Si2O7 groups) with additional (OH) Specific gravity: 3.3
Hardness: 6½ to 7
Streak: White
Colour: Brown, grey, violet, blue, greenish
Solubility: Insoluble in water, hydrochloric, nitric and sulphuric acid
Environments:

Plutonic igneous environments
Pegmatites
Metamorphic environments

Axinite occurs in cavities in granite, in pegmatites, and in the contact zones surrounding granitic intrusions.

Common impurities for Axinite-(Mg): Ti,V,Mn,Zn,K,H2O;
Common impurities for Axinite-(Mn): Ti,Fe,Mg,Na,K, H2O

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