Axinite
Real mineral · uncommon · Ca₂(Fe,Mn)Al₂BSi₄O₁₅(OH)
A complex calcium iron manganese boron silicate forming wedge-shaped crystals in skarns and metamorphic contact zones. Displays strong pleochroism, appearing brown, violet, or yellow depending on viewing direction.
Identity
- Formula
- Ca₂(Fe,Mn)Al₂BSi₄O₁₅(OH)
- Chemical class
- silicate
- Also known as
- Ferro-axinite (iron-rich), Tinzenite (manganese-rich)
Crystallography
- Crystal system
- triclinic
- Habits
- tabular, wedge-shaped, massive
- Fracture
- conchoidal
Physical properties
- Mohs hardness
- 7
- Density
- 3.31 g/cm³
- Luster
- vitreous
- Colors
- brown, violet-brown, gray, yellow, green
- Streak
- white
- Transparency
- transparent, translucent
Geology
- Origins
- metamorphic, hydrothermal
- Host rocks
- skarn, granite, limestone
- Associated minerals
- Grossular, Diopside, Epidote, Calcite
- Geography
- France, Russia, Mexico, USA, Australia
Classification
- Rarity
- uncommon
- Gem quality
- Yes
Arcane properties
- Affinity
- earth, arcane
- Effects
- warding, elemental earth
- Planar origin
- Material Plane
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