Gypsum

Formula

CaSO4∙2H20

Structure

Non-silicate

Crystal System

Crystal system: monoclinic (+)

Physical Properties

Colour in hand specimen: usually white or colourless
Cleavage: rhombohedral, one perfect, two distinct
Hardness: 2

Mineral Specimens

M530 Gypsum

Shotover, Oxford 
Single euhedral crystal 
Colourless, transparent 
Hardness 2; Soft – scratched with your fingernail

M531 Massive gypsum

Nottingham 
Fibrous habit – many fine crystals 
White-cream colour 
Translucent 
Pearly lustre

Mineral Name

gypsum
Gypsum