Kämmererite

Kämmererite was discovered in 1851 and is named after the A. Kämmer, the mining director at St. Petersburg.

Kämmererite is a chromium-bearing variety of Clinochlore with bright purple to a deep crimson red colour.

Fashioning of Kämmererite is very difficult because the crystals are usually thin, micaceous with a perfect cleavage.
General Information
A variety or type of:Clinochlore
Other Names/Trade Names:
Chemical Formula
(Mg,Al)
 
6
(Al,Cr)(Si,Al)
 
4
O
 
10
(OH)
Gemdat.org, Management Team (2012)
Photos of natural/un-cut material from mindat.org
Physical Properties of Kämmererite
Mohs Hardness2 to 2.5
Michael O’Donoghue, Gems, Sixth Edition (2006)
Specific Gravity2.60 to 2.64
Michael O’Donoghue, Gems, Sixth Edition (2006)
Cleavage QualityPerfect
Michael O’Donoghue, Gems, Sixth Edition (2006)
Optical Properties of Kämmererite
Refractive Index1.571 to 1.597
Michael O’Donoghue, Gems, Sixth Edition (2006) RI for the alpha, beta and gamma rays is 1.571–1.588, 1.571–1.588, 1.576–1.597
Optical CharacterBiaxial/+,-
Michael O’Donoghue, Gems, Sixth Edition (2006)
Birefringence0.003
Michael O’Donoghue, Gems, Sixth Edition (2006)
PleochroismPleochroism is notable, violet to hyacinth-red.
Michael O’Donoghue, Gems, Sixth Edition (2006)
Colour
Colour (General)Lilac to purple
Gemdat.org, Management Team (2012)
TransparencyTransparent,Translucent
Anthony et al, Handbook of mineralogy (2001)
LustrePearly,Greasy,Dull (Earthy)
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Kämmererite
Crystal SystemMonoclinic
Michael O’Donoghue, Gems, Sixth Edition (2006)
HabitThin to thick pseudohexagonal crystals
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Kämmererite information at mindat.org
Significant Gem Localities
Turkey
 
  • Erzurum Province
    • Aşkale District
      • Kop Daglari
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 420
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