Stichtite cabochon in serpentine matrix — commercial name Atlantasite or Tasmanite — available in 6 formats between 18–29 mm.
Piece Details
| Mineral |
Stichtite in serpentine (Mg₆Cr₂(OH)₁₆CO₃·4H₂O in antigorite / lizardite matrix) |
| Dimensions |
6 formats: 21×24 mm · 23×18 mm · 23×14 mm · 18×17 mm · 28×20 mm · 29×8 mm · thickness 4–7 mm (±0.5 mm) |
| Shape and back |
Freeform, flat back |
| Finish |
Mirror polish |
| Hardness |
3–4 effective Mohs (stichtite alone: 1.5–2; the serpentine matrix increases the hardness of the compound) — we recommend a closed bezel setting. Not suitable for frequently worn rings. |
| Origin |
Tasmania, Australia |
| Treatment |
Untreated |
| Piece type |
Available in 6 formats (select from the dropdown) |
This specific piece
In stichtite, color contrast is the main lapidary argument: the violet-pink of stichtite and the green of serpentine are complementary colors in the visible spectrum, creating a natural visual tension within the same stone.
Each of the 6 available formats presents a different proportion between the two mineralogies: some with more violet concentrated in specific areas, others with a more mottled pattern where stichtite and serpentine alternate.
How stichtite forms
Stichtite is a magnesium and chromium hydroxycarbonate that forms by hydrothermal alteration of ultramafic rocks (peridotite, dunite) rich in chromium.
For which setting it works
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925 silver pendants with closed bezel — the closed bezel is especially important here: with an effective hardness of 3–4 Mohs, the edge of the stichtite is vulnerable to rubbing. Silver creates a metal frame that protects and enhances the violet-green contrast.
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Dangle earrings — smaller formats (18–23 mm) are most suitable for earrings; the elongated format (29×8 mm) is ideal for an asymmetrical or geometric design earring.
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Wire wrap with soft wire — a feasible technique if working on the flat back and avoiding pressing the wire against the side edge. The chromatic contrast of stichtite is visually very strong: the wrap design should be restrained so as not to compete with the stone.
Stichtite in mineralogical tradition
Stichtite was first described in 1910 by A. S. Wesley, chief engineer of the Mount Lyell Mining and Railway Company in Queensland, Tasmania.
In crystal tradition, stichtite is associated with compassion and emotional openness. The violet-green contrast of the piece is interpreted as the union of mind (violet) and heart (green).
How to recognize genuine stichtite
Genuine stichtite shows a saturated, opaque violet with a green serpentine base.
Frequently Asked Questions
What is the difference between stichtite, sugilite, and charoite?
All three are violet minerals, but distinct. Sugilite (Mohs 5.5–6.5) is harder and has a warmer/reddish violet; charoite (Mohs 5–6) has a very characteristic fibrous pattern with lilac-lavender tones; stichtite (Mohs 1.5–2) is the softest of the three, always appears in a serpentine matrix, and has the coldest and most saturated violet when it is of Tasmanian quality.
Is it suitable for rings?
We do not recommend it for frequently worn rings. With an effective 3–4 Mohs (at best), the material scratches easily from daily wear and tear.
Has it received any treatment?
No detectable treatment. Statement based on lapidary observation; the piece does not include formal gemological certification.
Why does the proportion of violet vary between formats?
Stichtite forms irregular veins within serpentinite.
Are the dimensions exact?
The indicated dimensions have a tolerance of ±0.5 mm, typical of freeform cabochons.
How to care for it?
Clean with a soft, dry cloth. Avoid water, acids, and ultrasound — serpentine is sensitive to chemical agents. Store separately from harder stones. Consult our jewelry and stone care guide.
More about rare Tasmanian minerals: properties and meaning of stichtite. See also: cabochons for artisanal jewelry · 925 silver pendants.
