Axinite

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title: "Axinite" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["calcium-minerals", "iron(ii)-minerals", "manganese(ii)-minerals", "aluminium-minerals", "sorosilicates", "triclinic-minerals", "luminescent-minerals", "gemstones", "minerals-in-space-group-2", "hydroxide-minerals"] description: "Group of minerals" topic_path: "general/calcium-minerals" source: "https://en.wikipedia.org/wiki/Axinite" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Group of minerals ::

::data[format=table title="Infobox mineral"]

Field	Value
boxbgcolor	#756050
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
::

|boxbgcolor=#756050| name = Axinite | category = Cyclosilicates | boxwidth = | 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 | melt = | fusibility = | solubility = | other = | references =

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

References

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

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