Minerals identify

Know how to recognize them

Gypsum

Sulfate mineral

Gypsum is a soft sulfate mineral composed of calcium sulfate, with the chemical formula It is widely mined and is used as a fertilizer and as the main constituent in many forms of plaster /sidewalk chalk fine-grained white or lightly tinted variety of gypsum, called alabaster by many cultures including Ancient Egypt , Ancient Rome , and the Nottingham alabasters of Medieval England. Gypsum also crystallizes as translucent crystals of selenite mineral and as a hydration.

The Mohs scale of mineral hardness defines hardness value 2 as gypsum based on scratch hardness comparison.

Identification

Color of mineral

White
Yellow
Blue
Pink
Brown
Red
Grey

Mohs scale ( mineral hardness )

1.5

Density ( specific gravity )

1.519
1.522
1.529

Luster ( interacts light )

Silky
Vitreous
Pearly
Waxy

Crystal ( diaphaneity )

Monoclinic