- Axinite
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Axinite
Axinite – Deposit Topotype, FranceGeneral Category Borosilicates Chemical formula (Ca,Fe,Mn)3Al2BO3Si4O12OH or Ca2(Fe,Mn)Al2BSi4O15(OH) Identification Color Reddish brown to yellow to colorless. Blue, violet, grey. Crystal habit Tabular, wedge shaped crystals Crystal system Triclinic Cleavage Good on {100} Fracture Conchoidal Mohs scale hardness 6.0–7.5 Luster Vitreous Streak White Specific gravity 3.18–3.37 Optical properties Biaxial (-) Refractive index nα = 1.672–1.693
nβ = 1.677–1.701
nγ = 1.681–1.704Birefringence δ = 0.011 Pleochroism Strong References [1][2] Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro-silicate, (Ca,Fe,Mn)3Al2BO3Si4O12OH. Axinite is pyroelectric and piezoelectric.
The axinite group includes:[1]
- Axinite-(Fe), ferro-axinite, iron rich, lilac brown to black
- Axinite-(Mg), magnesio-axinite, magnesium rich, pale blue to gray
- Axinite-(Mn), manganaxinite, manganese rich, yellow-orange
- Tinzenite, iron – manganese intermediate, yellow
Gallery
References
Manganese minerals Borates Carbonates Oxides SimpleMixedBirnessite · Bixbyite · Ferrocolumbite · Ferrotantalite · Galaxite · Jacobsite · Manganotantalite · Psilomelane · Romanèchite · Tantalite · Todorokite · UmberPhosphates Childrenite · Graftonite · Lithiophilite · Natrophilite · Purpurite · Triplite · Triploidite · ZanazziiteSilicates Babingtonite · Bixbite · Braunite · Brownleeite · Calderite · Chloritoid · Eudialyte · Glaucochroite · Jeffersonite · Knebelite · Ottrelite · Piemontite · Pyroxferroite · Rhodonite · Spessartine · Sugilite · Tephroite · Zakharovite · ZircophylliteSulfides Other Axinite (borosilicate) · Geigerite (arsenate) · Manganese nodule (various) · Samsonite (Sulfosalt) · Zincobotryogen (sulfate)This article about a specific silicate mineral is a stub. You can help Wikipedia by expanding it.