Axinite
Get Axinite essential facts below. View Videos or join the Axinite discussion. Add Axinite to your PopFlock.com topic list for future reference or share this resource on social media.
Axinite
Axinite
Axinite-Oisan.jpg
Axinite - Deposit Topotype, France
General
CategoryCyclosilicates
Formula
(repeating unit)
(Ca,Fe,Mn)3Al2BO3Si4O12OH or Ca2(Fe,Mn)Al2BSi4O15(OH)
Strunz classification9.BD.20
Crystal systemTriclinic
Crystal classPinacoidal (1)
(same H-M symbol)
Space groupP1
Identification
ColorReddish brown to yellow to colorless. Blue, violet, grey.
Crystal habitTabular, wedge shaped crystals
CleavageGood on {100}
FractureConchoidal
Mohs scale hardness6.0-7.5
LusterVitreous
StreakWhite
Specific gravity3.18-3.37
Optical propertiesBiaxial (-)
Refractive indexn? = 1.672-1.693
n? = 1.677-1.701
n? = 1.681-1.704
Birefringence? = 0.011
PleochroismStrong
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:

  • Axinite-(Fe) or ferroaxinite, Ca2Fe2+Al2BOSi4O15(OH) iron rich, clove-brown, brown, plum-blue, pearl-gray[3]
  • Axinite-(Mg) or magnesioaxinite, Ca2MgAl2BOSi4O15(OH) magnesium rich, pale blue to pale violet; light brown to light pink[4]
  • Axinite-(Mn) or manganaxinite, Ca2Mn2+Al2BOSi4O15(OH) manganese rich, honey-yellow, clove-brown, brown to blue[5]
  • Tinzenite, (CaFe2+Mn2+)3Al2BOSi4O15(OH) iron - manganese intermediate, yellow, brownish yellow-green[6]

Axinite is sometimes used as a gemstone.[7]

Gallery

References

  1. ^ Axinite Archived November 19, 2008, at the Wayback Machine. Mineral Galleries
  2. ^ Axinite. Mindat
  3. ^ Handbook of Mineralogy: Ferroaxinite
  4. ^ Handbook of Mineralogy: Magnesioaxinite
  5. ^ Handbook of Mineralogy: Manganaxinite
  6. ^ Handbook of Mineralogy: Tinzenite
  7. ^ Tables of Gemstone Identification By Roger Dedeyne, Ivo Quintens p.147

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.

Axinite
 



 



 
Music Scenes