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Gemstone Crystal System Density Hardness Refractive index Treatments
Achroite trigonal 3.06 7.0-7.5 1.624-1.644 none known



achroite

Faceted Achroite Courtesy of Nicky Newark

Color:Colorless
Clarity: Transparent to Translucent
Optic Character:
DR, uniaxial negative
Fracture : Conhoidal
Luster : Vitreous to Resinous
Cleavage :
None
Durability:Excellent
UV Fluorescence: Inert
Characteristics for Identification:
RI, Birefringence, doubling o facet juctions

Localities:
Czech Republic, India, Nepal, Madagascar,Pakistan, UK, Nepal, USA..

Achroite
NaLi2.5 Al6.5 (BO3)3O18(OH)4

Achroite is a the colorless variety of tourmaline whch is usually (but not always) elbaite.

Achroite can be confused with:
All Colorless doubly refractive gems.

Including, but not limited to:
Quartz
Topaz
Spodumene
Scapolite
Oligoclase
Orthoclase
Calcite
Goshenite (colorless Beryl)
Danburite
Apatite
Enstatie
Grossular Garnet

achroite crystal