Axinite

Axinite is a mineral group containing several members – Axinite-(Fe), Axinite-(Mg), Axinite-(Mn) and Tinzenite.

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Information about Axinite

Axinite is a mineral group containing several members – Axinite-(Fe), Axinite-(Mg), Axinite-(Mn) and Tinzenite.

Axinite-(Fe) is the most common member of the group, but many specimens will simply be referred to as Axinite if they have not been analysed.

Axinite is strongly dichroic.


Uses and History

Axinite is not used industrially, but is sometimes used for jewellery. Rare specimens may be cut en cabochon or faceted. It is also prized by mineral collectors for its unusual, striking appearance.

Axinite was named in 1797 by the French mineralogist Rene Just Haüy. The name comes from the Greek ‘axina’ or ‘axe’, due to the sharp habit of its crystals.

 


Mineralogy

Chemistry
An aluminium boro-silicate mineral with the overall formula (Ca,Fe,Mg,Mn)3Al2BSi4O15(OH) .
Colours and Variations

Smoky brown, dark brown, purple or green brown. Black. Sometimes purple, blue, green.

Streak
Colourless
Luster
Vitreous.
Transparency
Transparent, translucent, opaque.
Fracture
Conchoidal to uneven.
Crystal habit
Flattened tabular crystals with sharp edges, typically in clusters. Can also be bladed, rosettes, massive, columnar.
Mohs hardness
6.5 – 7.0
Fluorescence
Some of the manganese bearing Axinite-(Mn) can be pink-red fluorescent.
Specific Gravity
3.3 – 3.4
Easiest testing method
Examining the crystal habit.

Hazards and Warnings

Mineral collectors should wash their hands after handling specimens, to avoid any exposure to potential toxins.

Almost all rocks, minerals (and, frankly, almost all other substances on earth) can produce toxic dust when cutting, which can cause serious respiratory conditions including silicosis.

When cutting or polishing rocks, minerals, shells, etc, all work should be done wet to minimise the dust, and a suitable respirator or extraction system should be used.

 


Translations

Arabic:

  • أكسينيت

Hindi:

Portuguese:

  • Axinita

Bengali:

Indonesian:

Punjabi:

English:

Italian:

Russian:

  • Аксинит

French:

Japanese:

  • アキシナイト

Spanish:

  • Axinita

German:

  • Axinit

Korean:

  • 액시나이트

Thai:

  • แอกซิไนต์

Gujurati:

Mandarin Chinese:

  • 斧石

Urdu:


Further Reading / External Links