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Axinite

Group of minerals

Field	Value
boxbgcolor	#756050	name = Axinite
category	Cyclosilicates
boxtextcolor	#FFFFFF
image	Axinite-Mn - Canta, Lima, Peru.jpg
caption	Manganaxinite
formula	or
IMAsymbol	Ax
strunz	9.BD.20
system	Triclinic
class	Pinacoidal ()
(same H-M symbol)
symmetry	P
color	Reddish brown to yellow to colorless. Blue, violet, grey.
habit	Tabular, wedge shaped crystals
cleavage	Good on {100}
fracture	Conchoidal
mohs	6.0–7.5
luster	Vitreous
refractive	nα = 1.672–1.693
nβ = 1.677–1.701
nγ = 1.681–1.704
opticalprop	Biaxial (−)
birefringence	δ = 0.011
pleochroism	Strong
streak	White
gravity	3.18–3.37
references

(same H-M symbol) nβ = 1.677–1.701 nγ = 1.681–1.704

Axinite is a brown to violet-brown, or reddish-brown bladed group of minerals composed of calcium aluminium boro-silicate, . 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
Axinite-(Mg) or magnesioaxinite, Ca2MgAl2BOSi4O15(OH) magnesium rich, pale blue to pale violet; light brown to light pink
Axinite-(Mn) or manganaxinite, Ca2Mn2+Al2BOSi4O15(OH) manganese rich, honey-yellow, clove-brown, brown to blue
Tinzenite (CaFe2+Mn2+)3Al2BOSi4O15(OH) iron – manganese intermediate, yellow, brownish yellow-green

Axinite is sometimes used as a gemstone.Tables of Gemstone Identification By Roger Dedeyne, Ivo Quintens p.147

Gallery

File:Axinite-64246.jpg|Clove-brown axinite crystals to 2.3 cm set atop matrix from the West Bor Pit at Dalnegorsk, Russia File:Axinite-60191.jpg|Chloritized bladed crystals of axinite forming on adularia from the Swiss Alps File:Tinzenite-Calcite-172430.jpg|Tinzenite on calcite, 4.5 × 3.5 × 3 cm. Wessels Mine, Kalahari manganese fields, Northern Cape Province, South Africa File:Axinite-(Mn)-239862.jpg|Manganaxinite (Axinite-(Mn)), with sharp curving crystals to 4 cm. West Bor Pit at Dalnegorsk, Russia

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[http://mineral.galleries.com/Minerals/Silicate/AXINITE/AXINITE.htm Axinite] {{webarchive. link. (November 19, 2008 . Mineral Galleries)
[http://www.mindat.org/min-440.html Axinite]. Mindat
[http://rruff.info/doclib/hom/ferroaxinite.pdf Handbook of Mineralogy: Ferroaxinite]
[http://rruff.info/doclib/hom/magnesioaxinite.pdf Handbook of Mineralogy: Magnesioaxinite]
[http://rruff.info/doclib/hom/manganaxinite.pdf Handbook of Mineralogy: Manganaxinite]
[http://rruff.info/doclib/hom/tinzenite.pdf Handbook of Mineralogy: Tinzenite]

Info: Wikipedia Source

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calcium-minerals iron(ii)-minerals manganese(ii)-minerals aluminium-minerals sorosilicates triclinic-minerals luminescent-minerals gemstones minerals-in-space-group-2 hydroxide-minerals

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