Gypsum and Anhydrite Gypsum are in the same mineral
group; the sulfate group. Gypsum is closely related to
Anhydrite Gypsum and is a hydrated form of Anhydrite
Gypsum. This reaction can go the other way; so,
Anhydrite Gypsum is a dehydrated form of Gypsum.
Anhydrite Gypsum is distinguishable from Gypsum by its
higher specific gravity and hardness.
Gypsum
- Chemical formula: CaSO4 .2H2O
- Composition: Hydrous Calcium Sulfate
- Colour: Colourness, white, gray, brown, beige, orange,
pink, yellow, light red, green
- Streak: White
- Hardness: 1.5-2
- Transparency: Transparent to opaque
- Specific gravity: 2.3-2.4
- Luster: Vitreous to pearly
- Fracture: Uneven
- Uses: Gypsum is an industrailly important mineral. It
is the primary ingredient of plaster-of-Paris (finely
ground Gypsum) and is used in the production of Cement.
It is also the main component of sheet-rock. It is used
as a flux for creating earthware, and can be used as a
fertilizer.
Anhydrite Gypsum
- Chemical formula: CaSO4
- Composition: Calcium Sulfate
- Coloour: Coulourless, white, gray, blue, red, brown
- Streak: White
- Hardness: 3-3.5
- Transparency: Transparent
- Specific gravity: 2.98
- Luster: Vitreous to pearly
- Fracture: Uneven, splintery
- Uses: Anhydrite Gypsum is used as a peanut corp
fertilizer and minor quantities are used for
manufacturing cement. It can also be used as storage
material for hazardous waste burial.
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