Metamorphic
Stichtite in Serpentine (Atlantisite)
Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)
Hardness: 2.5–4.0; Color: Lime green matrix with purple or burgundy inclusions; Luster: Waxy to greasy; Crystal Structure: Trigonal/Monoclinic; Specific Gravity: 2.5–2.6
- Hardness
- 2
- Color
- Lime green matrix with purple or burgundy inclusions
- Luster
- Waxy to greasy
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Physical properties
Hardness: 2.5–4.0; Color: Lime green matrix with purple or burgundy inclusions; Luster: Waxy to greasy; Crystal Structure: Trigonal/Monoclinic; Specific Gravity: 2.5–2.6
Formation & geological history
Formed via the hydrothermal alteration of ultramafic rocks (like peridotite or dunite); typically associated with Precambrian or Paleozoic geological environments where tectonic plate movement caused serpentinization.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons), and as a popular stone for collectors or spiritual practitioners.
Geological facts
The trade name 'Atlantisite' was coined by Gerald Pauley for the specific combination found at Stichtite Hill in Tasmania. It is one of the few gemstones that naturally combines bright purple and bright green minerals.
Field identification & locations
Identify in the field by its distinct 'pistachio' green color with purple spots and a soapy/greasy feel. It is relatively soft and can be scratched with a knife. Primarily found in Zeehan, Tasmania, but similar material occurs in South Africa and Canada.
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