metamorphic
Stichtite in Serpentine (Atlantisite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) / Mg3Si2O5(OH)4 (Serpentine)
Hardness: 1.5 - 2.5 (Stichtite), 3-5 (Serpentine matrix); Color: Vivid purple to lilac pink (Stichtite) in a pale green to yellow-green matrix (Serpentine/Pyrite); Luster: Waxy to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect basal.
- Hardness
- 1
- Luster
- Waxy to pearly
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Physical properties
Hardness: 1.5 - 2.5 (Stichtite), 3-5 (Serpentine matrix); Color: Vivid purple to lilac pink (Stichtite) in a pale green to yellow-green matrix (Serpentine/Pyrite); Luster: Waxy to pearly; Crystal structure: Trigonal/Hexagonal; Cleavage: Perfect basal.
Formation & geological history
Formed through the alteration of chromium-bearing ultrabasic rocks. It is a secondary mineral resulting from the hydrothermal alteration of chromite-bearing serpentine. Most notable deposits date back to the Precambrian era.
Uses & applications
Primarily used as a lapidary stone for decorative carvings, cabochons for jewelry, and as a highly sought-after mineral specimen for collectors. It is also significant in New Age communities as a 'healing crystal' under the trade name Atlantisite.
Geological facts
Stichtite was first discovered in 1910 in Tasmania, Australia, by Robert Sticht, the manager of the Mt. Lyell Mining and Railway Company. The combination of green serpentine and purple stichtite is found almost exclusively in one specific location in Tasmania.
Field identification & locations
Identify by its unique purple-on-green color contrast and low hardness (can be scratched by a fingernail). It is found predominantly in Zeehan, Tasmania (Stichtite Hill), but also in South Africa and Canada. For collectors, look for high-contrast purple spots vs. green matrix.
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