Inderite

Big Photo

Kazakhstan
3.10 carats
© Giovanni Scapin 2015

Inderite is named after its discovery locality, near the Lake Inder, Kazakhstan.

Inderite forms long prismatic crystals with one perfect cleavage which leaves behind a notably pearly surface. The material is colourless, soft and the surface is likely to have cloudiness or to develop a whitish appearance after fashioning.
General Information
Chemical Formula
MgB
 
3
O
 
3
(OH)
 
5
· 5H
 
2
O
Michael O’Donoghue, Gems, Sixth Edition (2006)
Physical Properties of Inderite
Mohs Hardness2.5
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Specific Gravity1.79
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical Properties of Inderite
Refractive Index1.488 to 1.505
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Optical CharacterBiaxial/+,-
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Birefringence0.017
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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Colour
Colour (General)Colourless
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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TransparencyTransparent
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
LustreVitreous,Pearly,Greasy,Dull (Earthy)
Anthony et al, Handbook of mineralogy (2001) Vitreous to pearly on cleavages, dull, greasy
Crystallography of Inderite
Crystal SystemMonoclinic
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
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HabitLong prismatic crystals
Michael O’Donoghue, Gems, Sixth Edition (2006)
Geological Environment
Where found:Occurs in lacustrine borate deposits
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Inderite information at mindat.org
Significant Gem Localities
Kazakhstan
 
  • Atyrau Region
    • Inder District
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 419
        • Mt Kzyl-tau
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 419
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