Minerals identify

Know how to recognize them

Greenockite

Sulfide mineral

Greenockite is a rare cadmium bearing metal sulfide mineral (CdS) in crystalline form. Greenockite crystallizes in the hexagonal system. It occurs as massive encrustations and as hemimorphic six-sided pyramidal crystals which vary in color from a honey yellow through shades of red to brown. The Mohs hardness is 3 to 3.5 and the specific gravity is 4.8 to 4.9.

Greenockite belongs to the wurtzite group and is isostructural with it at high temperatures. It is also isostructural with sphalerite at low temperatures. It occurs with other sulfide minerals such as sphalerite and galena , and is the only ore mineral of cadmium. Most cadmium is recovered as a byproduct of copper, zinc, and lead mining. It is also known from the lead-zinc districts of the central United States.

It was first recognized in 1840 in Bishopton , Scotland , during the cutting of a tunnel for the Glasgow, Paisley and Greenock Railway. The mineral was named after the land owner Lord Greenock (1783–1859).

Identification

Color of mineral

Yellow
Orange

Mohs scale ( mineral hardness )

3.0
3.5

The streak

Red
Orange

Density ( specific gravity )

2.529
2.506

Luster ( interacts light )

Adamantine
Resinous

Crystal ( diaphaneity )

Hexagonal