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sandstone

sandstone

SRI Petrography ID: 62

St. Margarethener
Burgenland

Names

[de] Sandstein
[en] sandstone

Description

Sandstone is a sedimentary rock formed by the cementation of grains of sand (0.063 to 2 mm in diameter). Often this cementing material is calcium carbonate, but also silica or iron oxides can be the cement. Depending on the kind of cement the hardness of sandstone varies.
Even though sandstones can contain nearly all colours, usually they are grey, brown, yellow, sometimes also red or green (containing clauconite) or white (with kaolinite).
Varieties of sandstone are:
- quartz arenites (composed of well sorted and rounded quartz grains)
- arkose (containing more than 25 vol% feldspar)
- greywacke (grey to green or black rock composed of rock fragments, mostly angular quartz and feldspar grains in a clay matrix).
- lithic sandstone (contain fragments of fine-grained rocks, mostly shales, volcanic rocks, metamorphic rocks)
- calcite arenite with calcite cement and calcite grains
- algae or coral sandstone with organic fragments

Color

all colours, usually grey, brown, yellow, red or green or white

Grain Size

fine grained (grains 0.06 to 2 mm in diameter)

Texture

massive, banked, bedded, cross bedded

Minerals

grains often quartz, shells
cement mostly calcite, sometimes iron oxides, silica

Occurences

various sites

Classification

Class

SEDIMENTARY ROCKS

Broader Terms

clastic sedimentary rocks

Narrower Terms

Austria-sandstone

Bulgaria-sandstone

Croatia-sandstone

Germany-sandstone

Hungary-sandstone

Italy-sandstone

Poland-sandstone

Slovenia-sandstone