Sandstone
Sandstone is made of sand grains (0.05mm to 2mm) that may have been deposited in the sea, by rivers, or in deserts, and later cemented together by minerals precipitated from groundwater.
Most sandstones are made up largely of quartz grains, because quartz is a very hard and chemically-resistant mineral. Quartzite is a name given to very hard, pure quartz sandstones.
Many sandstones contain some grains of other minerals like calcite, clay, or mica.
Most sandstones are made up largely of quartz grains, because quartz is a very hard and chemically-resistant mineral. Quartzite is a name given to very hard, pure quartz sandstones.
Many sandstones contain some grains of other minerals like calcite, clay, or mica.
