SCHORLOMITE
Class : Silicates
Subclass : Nesosilicates
Crystal system : Cubic
Chemistry : Ca3Ti2(Fe2Si)O12
Rarity : Rare
Schorlomite is a titaniferous variety of andratite, containing more than 15% TiO2. Andratite is the ferrous term of the group of calcium garnets also called ougrandite. Andratite forms two series with grossular on the one hand and with ouvarovite on the other. Like melanite (the other titaniferous variety of andratite), it is mainly a mineral of alkaline rock complexes, particularly carbonatites, although it can also be found in some skarns. Its name comes from schorl and the Greek homos (similar), because it resembles the black variety of tourmaline. Indeed, its high titanium content gives it a black or very dark color. Its crystals are most often dodecahedral.
Main photo : Schorl from Erongo Mountains, Usakos, Namibia
Schorlomite in the World
Twinning
No twinning known for this mineral species.
Fakes and treatments
No fakes listed for this mineral species.
Hardness : 7 to 7.5
Density : 3.86
Fracture : Conchoidal
Streak : Black to orange-red
TP : Translucent to opaque
RI : 1.940 to 1.980
Birefringence : 0
Optical character : None
Pleochroism : None
Fluorescence : None
Solubility : Hydrofluoric acid
Magnetism : NoneRadioactivity : None