Granite Rock??? Granite is a light-colored, coarse grained intrusive igneous rock that is mainly rich in quartz and feldspar with minor amounts of mica, amphiboles etc. This mineral composition results in granite color variation which is a percentage of each mineral found in the sample. The crystals in granite provide a variety of mixed colors — feldspar (pink or red), mica (dark brown or black), quartz (clear pink, white, or
Marble is a metamorphosed carbonate rock (limestone or dolomite rock) or simply a carbonate rock that was subjected to heat and pressure. In its pure form, marble is a white stone with a crystalline and sugary appearance, consisting of calcium carbonate (CaCO3). True marble forms from limestone but there is also dolomitic marble, which forms when dolomite CaMg(CO3)2 undergoes metamorphism. (hardness, properties) Most marble forms at convergent plate boundaries where
Quartzite is a hard, non-foliated metamorphic rock (majorly made of quartz) formed by metamorphosed sandstone which is converted into quartzite through heating and pressure usually related to tectonic compression within orogenic belts. Quartzite is usually white to gray in color although some rock units are stained by impurities to become pink, red, purple, yellow, orange, brown, green, or blue. It’s resistant to chemical weathering and often forms bare ridges and
Wondering where you’ve seen this rock???.. Check your bathroom… Pumice is a light-colored, extremely porous igneous rock that forms when highly pressurized, super-heated molten rock, with its incorporated water and gases, violently erupts to the surface during volcanic explosions. The rock undergoes rapid cooling and rapid depressurization and the vapour dissolved in it is suddenly released and the whole mass swells up into a froth that is immediately consolidated. Small
Obsidian is an igneous rock formed by the rapid cooling of viscous lava that is rich in silicate minerals. As silicate-rich magma extrudes the earth’s crust, it falls over the water bodies or other surfaces that are in contact with water and the lava gets cooled and consolidated instantly without any crystallization; resulting in a volcanic glass with a smooth uniform texture that breaks with a conchoidal fracture. Obsidian is
