|Chemical composition|| Ca3Fe2(SiO4)3
Calcium Iron Silicate
|Lustre||Vitreous to adamantine|
Green, yellow-green and black.
- Fine curving asbestos fibres in a radiating pattern ("horse-tail") in demantoid.
With an RI of about 1.89, the readings are outside the limit of the standard gemological refractometer.
Sinks in all common heavy liquids.
Chelsea Color Filter
Demantoid appears reddish or pinkish.
Demantoid has a specific pattern due to iron and chromium.
The dispersion in andradite garnets is high (0.057) and is partially masked by body color.
Demantoid is the green variety of andradite.
Melanite is the black, opaque variety which is mostly used in mourning jewelry.
Topazolite is the lemon yellow variety of andradite.
Grandite is a brownish variety of grossular-andradite and has lower values compared to the other varieties of andradite. It's name is often used to indicate the whole grossular-andradite intermediate series. Refractive index: 1.780-1.82