Stichtite
Mineral Mg6Cr2(CO3)(OH)16·4H2O
Also called Atlantisite (with serpentine)
About it
Lilac to purple, waxy masses and veins in serpentinite, often mixed with green serpentine and cut into cabochons. Best known from Dundas, Tasmania; stichtite in green serpentine is sold as 'atlantisite'.
- Type
- Mineral
- Group
- Carbonate, hydrotalcite group
- Formula
- Mg6Cr2(CO3)(OH)16·4H2O
- Hardness (Mohs)
- 1.5–2
- Specific gravity
- 2.1–2.2
- Streak
- white to pale lilac
- Lustre
- waxy, pearly, greasy
- Crystal system
- Trigonal
- Colours
- lilac, purple, pink
- Transparency
- translucent, opaque
- Cleavage and fracture
- perfect basal; flexible plates
Typical values: real specimens vary. For more, see mindat.org.