DIABASE/DOLERITE EGG 59 X 46 MM 175 G

Diabase, also called dolerite or microgabbro, is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro. Diabase is fine- to medium-grained, dark grey to black intrusive igneous rock. Chemically and mineralogically, diabase closely resembles the volcanic rock basalt, but it is somewhat coarser and contains glass. With increase in grain size, diabase may pass into gabbro. 

Diabase typically has a mineral composition that is dominated by the plagioclase feldspar known as labradorite. Most of the remainder is made up of pyroxene minerals, usually augite. Minor amounts of hornblende, olivine, magnetite, and quartz can be found in some diabase rocks.

This listing is for a Diabase in the shape of an egg originating from Karelia, Russia. The stone is dark to light grey in colour and patterns. The  measurement is 59 mm high, 46 mm wide, and weight is 175 g.

Combined postage available.