Oval Tasmanian stichtite cabochon, 26x14x6 mm, featuring the characteristic purple-pink-lavender palette of this extremely rare mineral. Compact format ideal for rings and pendants with a contained profile. Selected from a wholesale lapidary market.
Piece Details
| Mineral |
Stichtite (hydrated magnesium and chromium carbonate) |
| Dimensions |
26x14x6 mm |
| Shape and Back |
Oval shape, flat back |
| Finish |
Mirror polish |
| Hardness |
1.5-2 Mohs - we recommend a full closed bezel setting; its extreme softness means any exposed edge will scratch with daily use |
| Origin |
Tasmania, Australia |
| Treatment |
Untreated |
| Piece Type |
Available in 1 format |
This Specific Piece
The 26x14x6 mm dimensions place this cabochon in the range of a large stone ring or a compact pendant: generous enough to show the color well, without being monumental. The oval shape contains the most saturated purple area in the center, with natural transitions to lavender at the edges.
The 6 mm thickness facilitates bezel setting: the lapidary has left sufficient height for the bezel wall to have real grip. A technical choice that jewelers appreciate.
How Stichtite Color is Formed
Stichtite precipitates in ultramafic serpentinite fractures when magnesium and chromium-rich fluids alter mantle rocks at low temperatures. Cr³⁺ ions substitute Mg²⁺ in the crystal lattice and generate the absorptions in the visible spectrum that we perceive as purple-pink. In Tasmania, this process occurred during the Cambrian tectonic movements, about 500 million years ago.
What Mounting It Works For
-
High closed bezel setting (925 silver) - with a hardness of 1.5-2, the bezel should cover at least 1.5 mm of the wall to protect the flanks.
-
Statement rings in silver with a central stone - the 26x14 mm format fits large oval settings; the purple contrasts cleanly with silver.
-
Wire wrap - the oval shape is simple to work with; the wire surrounds the perimeter and protects the edges.
Stichtite in Lapidary Tradition
Described in 1910 at the Mount Lyell mine (Tasmania), it spent decades as a mineralogical rarity before attracting lapidaries. Today, Tasmania is almost the exclusive source of gem-quality stichtite. In crystal tradition, it is associated with empathy and inner calm. Symbolic properties shared for educational purposes, not as medical advice.
How to Recognize Genuine Stichtite
Stichtite has irregular purple-green veining with a waxy or resinous luster. It is so soft (1.5-2 Mohs) that it can be scratched with a fingernail. Density 2.1-2.2 g/cm³, higher than plastic but lower than most semi-precious stones.
Frequently Asked Questions
Is this cabochon a unique piece?
It is a batch of pieces of similar dimensions (26x14x6 mm with ±0.5 mm tolerance). The chromatic character varies slightly depending on the distribution of chromium in the vein.
How do I properly set stichtite?
Closed bezel with a wall at least 1.5 mm high. Avoid prong settings. With a hardness of 1.5-2 Mohs, the perimeter requires total protection.
Does it have any treatment?
No detectable treatment. No apparent dyeing or stabilization. Statement based on lapidary observation; does not include gemological certification.
What is the dimensional tolerance?
±0.5 mm tolerance in any direction.
How do you care for stichtite?
Soft dry cloth. No ultrasonic or steam cleaners. Store in a padded case separate from harder gemstones. See Jewelry Care.
Explore more Tasmanian minerals in our cabochon collection.
