Minerals identify

Know how to recognize them

Creedite

Halide mineral

Creedite is a calcium fluoro with formula: Ca3Al2SO4(F,OH)10·2(H2O). Creedite forms colorless to white to purple monoclinic prismatic crystals. It often occurs as acicular radiating sprays of fine prisms. It is translucent to transparent with indices of refraction of nα = 1.461 nβ = 1.478 nγ = 1.485. It has a Mohs hardness of 3.5 to 4 and a specific gravity of 2.7.

Creedite was first described in 1916 from the Creede Quadrangle in Mineral County, Colorado. It is a product of intense oxidation deposits.

Identification

Color of mineral

White
Violet
Orange

Mohs scale ( mineral hardness )

3.5

Density ( specific gravity )

1.461
1.478
1.485

Luster ( interacts light )

Vitreous

Crystal ( diaphaneity )

Monoclinic