Axinite

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Axinite

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Description

A rare, transparent clove-brown gemstone with flashes of violet and gray. Axinite was first discovered in Bourg d'Oisans in France. Current sources include alluvial deposits in Sri Lanka and some mines in the U.S.(California, Nevada, New Jersey). Axinite crystals can also be colorless, yellow, or black. The crystals are pyroelectric and piezoelectric.

Synonyms and Related Terms

Axinit (Deut.); axinita (Esp.)

Raman

AxiniteRS.jpg

Raman

Axiniteitaly2.jpg


Other Properties

Triclinic crystal system often found as flattened tabular crystals with sharp edges and striations. Cleavage good in one direction. Fracture = uneven to conchoidal.

Luster = vitreous. Streak = colorless.

Composition (Ca,Mn,Fe,Mg)3Al2BSi4O15(OH)
Mohs Hardness 6.5 - 7.0
Density 3.3-3.4
Refractive Index 1.67 - 1.70

Additional Images


Sources Checked for Data in Record

  • R.F.Symmes, T.T.Harding, Paul Taylor, Rocks, Fossils and Gems, DK Publishing, Inc., New York City, 1997
  • C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
  • Encyclopedia Britannica, http://www.britannica.com Comment: "axinite." Encyclop√¶dia Britannica. 2005. Encyclop√¶dia Britannica Premium Service. 3 Sept. 2005 : hardness = 6.5-7, ri=1.67-1.70, sp=3.3-3.4

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