sanika

ROCKS AND MINERALS

by sanika

​LIMESTONE

​Limestone is a sedimentary rock made of calcium carbonate (CaCO₃), usually in the form of calcite or aragonite. It may contain considerable amounts of magnesium carbonate (dolomite) as well. However, minor constituents of clay, iron carbonate, feldspar, pyrite, and quartz is also commonly present.

​MARBLE

​Marble is a kind of metamorphic rock made of recrystallized Calcite or Dolomite. ... The word Marble is derived from Greek terminology that means a crystalline and shining rock. The rock has the capability to gleam and shine. The metamorphism of pure limestone or dolomite results in the formation of marble stone.

​BASALT

Basalt is a common extrusive volcanic rock, which is usually grey to black and fine-grained due to rapid cooling of lava at the surface of a planet​

​PUMICE

​Pumice called pumicite in its powdered or dust form, is a volcanic rock that consists of highly vesicular rough textured volcanic glass, which may or may not contain crystals. It is typically light colored. ... Pumice is created when super-heated, highly pressurized rock is violently ejected from a volcano.