Shining diamonds speckle the dark, igneous rock that lines the pipe, and the diamonds themselves contain tiny bits of other minerals from hundreds of miles beneath Earth's surface.

Revise the characteristics of igneous, sedimentary and metamorphic rocks and how they are formed over a long period of time.

Visual inspection of the dark gray rock suggested that it was probably a fine-grained basaltic igneous rock formed by the crystallization of magma near the planet’s surface.

In it the rocks are described as a number of families that have strict quantitative limits, the factors concerned being the ratio of the light-coloured and dark-coloured minerals present, the ...

THIS is a pleasantly written but withal scientific explanation of the sculplturing of the land which forms the Torquay promontory. The natural attractions of the region are great, and Torquay ...

Scientists unearthed the mineral from a volcanic site in South Africa known as the Koffiefontein pipe. Shining diamonds speckle the dark, igneous rock that lines the pipe, and the diamonds ...

Visual inspection of the dark gray rock suggested that it was probably a fine-grained basaltic igneous rock formed by the crystallization of magma near the planet's surface.