Axinite

Formula: (Fe) Ca2Fe2+Al2B[4][O|OH|(Si2O7)2, (Mg)Ca2MgAl2B[4][O|OH|(Si2O7)2], (Mn) Ca2Mn2+Al2B[4][O|OH|(Si2O7)2] Colour: (Fe) shades of brown, violet with appropriate orientation, partially zoned with blue spots. (Mg) Delicate pinks, violets and blues, strong orange and yellow…
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