Minerals identify

Know how to recognize them

Sellaite

Halide mineral

Sellaite is a magnesium mineral with the formula MgF2. It crystallizes in the tetragonal crystal system typically as clear to white vitreous prisms. It may be fibrous and occur as radiating aggregates. It has a Mohs hardness of 2.97 to 3.15. Refractive index values are nω = 1.378 and nε = 1.390.

Identification

Color of mineral

White

Mohs scale ( mineral hardness )

5

Density ( specific gravity )

1.378
1.39

Luster ( interacts light )

Vitreous

Crystal ( diaphaneity )

Tetragonal