Ankerite


Composition: Ca(Fe2+,Mg)(CO3)2
Crystal System : Trigonal
Colours: Tan, pale-brown
Lustre : Vitreous, pearly
Hardness (H) : 3.5-4.0
Specific Gravity (S.G) : 2.93-3.10

Distribution

Rare. Listed by Lombaard et al (1986) as a rare and sparsely distributed mineral.