Axinite
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Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro-silicate, Template:Chem2. Axinite is pyroelectric and piezoelectric.
The axinite group includes:
- Axinite-(Fe) or ferroaxinite, Ca2Fe2+Al2BOSi4O15(OH) iron rich, clove-brown, brown, plum-blue, pearl-gray[1]
- Axinite-(Mg) or magnesioaxinite, Ca2MgAl2BOSi4O15(OH) magnesium rich, pale blue to pale violet; light brown to light pink[2]
- Axinite-(Mn) or manganaxinite, Ca2Mn2+Al2BOSi4O15(OH) manganese rich, honey-yellow, clove-brown, brown to blue[3]
- Tinzenite (CaFe2+Mn2+)3Al2BOSi4O15(OH) iron – manganese intermediate, yellow, brownish yellow-green[4]
Axinite is sometimes used as a gemstone.[5]
Gallery
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Clove-brown axinite crystals to 2.3 cm set atop matrix from the West Bor Pit at Dalnegorsk, Russia
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Chloritized bladed crystals of axinite forming on adularia from the Swiss Alps
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Tinzenite on calcite, 4.5 × 3.5 × 3 cm. Wessels Mine, Kalahari manganese fields, Northern Cape Province, South Africa
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Manganaxinite (Axinite-(Mn)), with sharp curving crystals to 4 cm. West Bor Pit at Dalnegorsk, Russia
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References
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Template:Manganese minerals Template:Authority control
- ↑ Handbook of Mineralogy: Ferroaxinite
- ↑ Handbook of Mineralogy: Magnesioaxinite
- ↑ Handbook of Mineralogy: Manganaxinite
- ↑ Handbook of Mineralogy: Tinzenite
- ↑ Tables of Gemstone Identification By Roger Dedeyne, Ivo Quintens p.147