Ferroaxinite “Axinite-(Fe)”

Axinite-(Fe), Calcite Locality: Bor Pit (Boron Pit; Bor Quarry), Dal’negorsk B deposit, Dal’negorsk (Dalnegorsk; Tetyukhe; Tjetjuche; Tetjuche), Kavalerovo Mining District, Primorskiy Kray, Far-Eastern Region, Russia size: 3.2 × 3.3 × 2.9 cm Copyright © fabreminerals

Chemical Formula: Ca2Fe2+Al2BOSi4O15(OH)
Locality: Boug d’Oisans, France.
Name Origin: From the Greek acine – “ax” in allusion to the acute shape of typical crystals and the Latin – ferrum – “iron” in reference to the Fe in the chemical formula.
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.

Physical Properties

Cleavage: {100} Distinct, {001} Poor, {110} Poor
Color:   Brown, Purplish blue, Gray, Greenish yellow.
Density: 3.27 – 3.29, Average = 3.28
Diaphaneity: Transparent to subtranslucent
Fracture: Brittle – Conchoidal – Very brittle fracture producing small, conchoidal fragments.
Hardness: 6.5-7 – Pyrite-Quartz
Luminescence: Non-fluorescent.
Luster: Vitreous (Glassy)
Streak: white

Photos :

Axinite-(Fe) Puiva Mount, Saranpaul, Prepolar Ural, Tyumenskaya Oblast’, Urals Region, Russia Size: 3.5 x 3.0 x 1.5 cm © danweinrich
Axinite-(Fe) Khyber Agency, Federally Administered Tribal Areas, Pakistan Size: 15.0 x 13.0 x 7.0 cm © danweinrich
Axinite-(Fe) Puiva Mount, Saranpaul, Prepolar Ural, Tyumenskaya Oblast’, Urals Region, Russia Size: 5.8 x 4.3 x 4.2 cm © danweinrich
New Melones Dam, Copperopolis, Calaveras Co., California, USA © Dan & Diana Weinrich Minerals
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