Minerals identify

Know how to recognize them

Gordaite

Sulfate mineral

Gordaite is a sulfate mineral composed primarily of hydrous chloride with formula: NaZn4(SO4)(OH)6Cl·6H2O. It was named for the discovery location in the Sierra Gorda. Gordaite forms as tabular trigonal crystals.

Gordaite first appeared after a research dive in September 1984 from the Juan de Fuca Ridge of the northeastern side of the Pacific Ocean. Gordaite was also described from weathered slag deposits as a result of copper smelting The mineral exhibits a hexagonal shape with clear or white (green if cuprian – Cu2+) crystals ranging from planar to broad habit and has a point group of 3. Gordaite commonly occurs near minerals such as sphalerite and gypsum. The most recent finding occurred in the San Francisco mine in Chile where copper-zinc sulfide deposits were found.

Identification

Color of mineral

White
Green
Copper

Mohs scale ( mineral hardness )

2.5

Density ( specific gravity )

1.561
1.538

Luster ( interacts light )

Pearly
Vitreous

Crystal ( diaphaneity )

Trigonal