metamorphic
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
Hardness: 3-4 (Mohs), Color: localized purple/pink spots in a green matrix, Luster: waxy to greasy, Crystal Structure: Trigonal (Stichtite) and Monoclinic (Serpentine), Cleavage: Perfect basal.
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Physical properties
Hardness: 3-4 (Mohs), Color: localized purple/pink spots in a green matrix, Luster: waxy to greasy, Crystal Structure: Trigonal (Stichtite) and Monoclinic (Serpentine), Cleavage: Perfect basal.
Formation & geological history
Formed through the hydrothermal alteration of ultramafic rocks (serpentinization of chromite-bearing rocks). Primarily found in Precambrian geological formations.
Uses & applications
Used primarily for ornamental carvings, polished cabochons for jewelry, and as a popular collector's mineral specimen.
Geological facts
The specific combination shown is often called 'Atlantasite', a trade name for the material found at Stichtite Hill in Tasmania. Stichtite was first discovered in 1910.
Field identification & locations
Identify by the unique 'point' of purple stichtite within a lime-green serpentine matrix. Commonly found in Tasmania (Australia), South Africa, and Canada. Known to be quite soft.
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