metamorphic

Stichtite in Serpentinite (Atlantisite)

Mg6Cr2CO16(OH)16·4H2O in Mg3Si2O5(OH)4

AI-generated identification · may be incorrect

Hardness: 1.5 to 2.5 for Stichtite, 2.5 to 5.5 for Serpentinite matrix. Color: Bright purple to magenta veins within yellowish-green or olive green serpentinite. Luster: Pearly, greasy, to waxy. Crystal Structure: Trigonal (stichtite), Monoclinic/Orthorhombic (serpentine).

Hardness: 1
Luster: Pearly, greasy, to waxy

Identified July 23, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed through the metamorphic alteration of chromium-rich ultramafic rocks (peridotite or serpentinite) under hydrothermal conditions. The chromium gives stichtite its characteristic rich purple color.

Uses & applications

Used predominantly as a gemstone in lapidary work, cut into polished cabochons, carved ornaments, and used in wire-wrapped or silver-set jewelry. Highly popular among rock and mineral collectors.

Geological facts

First discovered in 1910 in Zeehan, Tasmania, Australia, and named after Robert Carl Sticht, a mine manager. The trade name 'Atlantisite' specifically refers to high-grade specimens from the Stichtite Hill locality in Tasmania.

Field identification & locations

Identified by the distinct contrast of vibrant purple veins/patches within a green serpentine host rock. Primary sources include Tasmania (Australia), South Africa (Barberton district), and Canada. Collectors look for strong color contrast and solid polish without deep fractures.