Stichtite is a beautiful cabochon type gem. Massive material is occassionally cut as cabochons but more often carved and polished as decorative items such as bookends, etc. The color is usually lilac to pink or even purple and sometimes veined with green serpentine or other contrasting minerals. This color combination is very attractive. Main sources are Black Lake, Quebec, Canada; Dundas, Tasmania, Australia; Urals Region, Russia; Limpopo and Mpumalanga Provinces, South Africa.

Category: Carbonate minerals
Formula: Mg6Cr2CO3(OH)16·4H2O
Crystallography: Trigonal – Hexagonal Scalenohedral
Crystal Habit: As aggregates of fibers or plates, commonly matted, contorted; as cross-fiber veinlets and micaceous scales.


Cleavage: [0001] Perfect
Fracture: Uneven
Tenacity: Laminae flexible, not elastic; greasy feel
Moh’s Hardness: 1.5 – 2.0
Density: 2.16 – 2.20 (g/cm3)
Radioactivity: Not Radioactive


Color: Lilac to Rose pink
Transparency: Opaque
Luster: Pearly, Waxy, Resinous, (greasy feel)
Refractive Index: 1.516 – 1.542  Uniaxial ( + )
Birefringence: 0.0260
Dispersion: n/a
Pleochroism: Weak; O = dark rose-pink to lilac; E = light rose-pink to lilac