Stichtite

Big Photo

South Africa
4.55 carats
© Giovanni Scapin 2015

Stichtite was discovered in 1910 in Dundas, Tasmania, Australia. It was named after Robert Carl Sticht the manager of the nearby Mt Lyell copper mine.

Stichtite is purplish pink to purplish rose-red in colour and it is often associated with a chromite and green serpentine. This combination makes interesting specimens and attractive ornamental stone for carvings.
General Information
Chemical Formula
Mg
 
6
Cr
 
2
(CO
 
3
)(OH)
 
16
· 4H
 
2
O
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Photos of natural/un-cut material from mindat.org
Physical Properties of Stichtite
Mohs Hardness1.5 to 2
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Specific Gravity2.11 to 2.20
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Cleavage QualityPerfect
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
FractureUneven
Arthur Thomas, Gemstones (2009)
Optical Properties of Stichtite
Refractive Index1.516 to 1.544
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Optical CharacterUniaxial/-
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
Birefringence0.024 to 0.028
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
PleochroismDistinct
Arthur Thomas, Gemstones (2009)
DispersionNil
Arthur Thomas, Gemstones (2009)
Colour
Colour (General)Rose-pink, light violet, lilac
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
TransparencyTranslucent,Opaque
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
LustrePearly,Greasy
Arthur Thomas, Gemstones (2009)
Crystallography of Stichtite
Crystal SystemTrigonal
Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
More from other references
HabitAggregates of fibres or plates
Michael O’Donoghue, Gems, Sixth Edition (2006)
More from other references
Geological Environment
Where found:Occurs as an alteration product of chromite in serpentinite
Michael O’Donoghue, Gems, Sixth Edition (2006)
Further Information
Mineral information:Stichtite information at mindat.org
Significant Gem Localities
Australia
 
  • Tasmania
    • West Coast municipality
      • Zeehan District
        • Dundas mineral field
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 456
South Africa
 
  • Mpumalanga
    • Ehlanzeni District
      • Barberton
Gems, Sixth Edition, Michael O’Donoghue, 2006, p. 456
Copyright © Jolyon & Katya Ralph 1993-2019. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.