Kurnakovite Value, Price, and Jewelry Information


Kurnakovite
Rob Lavinsky, iRocks.com – CC-BY-SA-3.0 [CC-BY-SA-3.0], via Wikimedia Commons

Kurnakovite is similar to inderite. Both are colorless and very uninteresting as faceted gems, which is why very few have been cut. The material is obtainable in large size, but softness and cleavage make cutting a real chore.

Kurnakovite Value

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Kurnakovite Information

DataValue
NameKurnakovite
Is a Variety ofInderite
Crystallography Triclinic. Crystals large and blocky, often in clusters; large cleavable masses; aggregates.
Colors Colorless, with a white surface coating.
Fracture Conchoidal. Brittle.
Hardness 2.5-3.
Specific Gravity 1.78-1.85
Birefringence 0.027-0.036.
Cleavage Good 1 direction.
Stone SizesCalifornia material could yield stones of several hundred carats from large transparent masses or cleavages.
Luminescence None.
Spectral Not diagnostic.
FormulaMg2B611 · 15H2O.
Pleochroism None.

Optics: a = 1.488-1.491 ; β= 1.508-1.511;  γ= 1.515-1.525.

Biaxial (+), 2V= 80°.

Occurrence: Borate deposits in arid areas.

Inder Lake. Kazakhstan. USSR.

Boron, Kern County California: crystals to 24 inches across and large masses.

Comments: Kurnakovite is similar to inderite. Both are colorless and very uninteresting as faceted gems, which is why very few have been cut. The material is obtainable in large size, but softness and cleavage make cutting a real chore.

Name: After N. S. Kurnakov, Russian mineralogist and chemist.