GENERAL GEOLOGY

Detailed explanation-1: -diabase, also called Dolerite, fine-to medium-grained, dark gray to black intrusive igneous rock. It is extremely hard and tough and is commonly quarried for crushed stone, under the name of trap.

Detailed explanation-2: -What is dolerite? It’s a rock that was once molten magma, like granite, but because it occurs in smaller and thinner volumes it cooled faster and so the mineral crystals in it are much smaller and you can only see them with a hand lens.

Detailed explanation-3: -diorite, medium-to coarse-grained intrusive igneous rock that commonly is composed of about two-thirds plagioclase feldspar and one-third dark-coloured minerals, such as hornblende or biotite.

Detailed explanation-4: -Diorite is a plutonic igneous rock composed of coarse grains of plagioclase feldspar and less than 40 percent hornblende (see amphibole) and biotite (see mica), or, more rarely, pyroxene or olivine.

Detailed explanation-5: -Dolerite is the name given to the medium-grained intrusive basic igneous rock commonly found in dykes and sills; in North America and continental Europe it is often referred to as diabase, but many authors restrict this term to altered dolerite.