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non-carbonate salts

non-carbonate salts

SRI Petrography ID: 15

Names

[de] Nicht-karbonatische Salze
[en] non-carbonate salts

Description

The most common non-carbonate salts are gypsum and anhydrite.
Gypsum is a weak but compact, transparent, white or grey coloured mineral of hydrous calcium sulfate (CaSO4*2H2O). Gypsum differs from anhydrite by having to molecules of crystal-water. Anhydrite is sometimes a sedimentary rock-forming mineral, building up the rock type “anhydrite”. Anhydrite usually occurs as layers in gypsum deposits in association with limestone, dolomite, and salt beds.

Color

colorless, white or gray coloured

Grain Size

fine grained

Texture

massive, dense, banded

Minerals

gypsum, anhydrite, salt minerals, clay minerals

Occurences

worldwide

Comments

The phase transition from the water-free anhydrite to water-bearing gypsum causes an increment in volume, what often causes serios problems in technical geology.

Classification

Class

SEDIMENTARY ROCKS

Narrower Terms

anhydrite-stone

gypsum-stone

phosphate