Geology

Geology

The scientific study of the origin, history, and physical features of the earth.

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Geology > Minerals

bloodstone

Geology; Minerals

Also called heliotrope, is a form of Chalcedony, a type of quartz. Bloodstone is green jasper with red inclusions. The red is sometimes caused by iron oxide or red jasper. Its ...

peridot

Geology; Minerals

It is the gem variety of the mineral olivine. The origin of its name is either the Arabic word "faridat" meaning "gem" or the French word "peritot" meaning "unclear". Peridot is ...

ruby

Geology; Minerals

Red variety of the mineral Corundum, which is composed of aluminium oxide. The red colour is caused mainly by chromium and titanium. It is natural for rubies to have ...

turquoise

Geology; Minerals

Turquoise is composed of aluminium phosphate and copper. Its name originates from the French word for Turkish stone, as in ancient days it was transported through Turkey. It was ...

jasper

Geology; Minerals

Jasper is a micro crystalline quartz, made from very small grains. It is semi-translucent to opaque. Jasper has been used for thousands of years as tools and weapons during ...

opal

Geology; Minerals

A type of quartz. Its name originates from the Sanskrit word "upala" meaning precious stone. They are luminous and iridescent with inclusions of many colours. Opals show a ...

coral

Geology; Minerals

The hard skeleton of red coral branches, made up mostly of calcium carbonate, which is durable and intensely coloured. Coral can be polished to a glassy shine. Usually deep water ...