The word granite comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a crystalline rock.
Granite (play /ˈɡrænɨt/) is a common widely occurring intrusive, felsic, igneous rock which is granular and crystalline in texture. This rock consists mainly of quartz, mica, and feldspar. Occasionally some individual crystals (phenocrysts) are larger than the groundmass, in which case the texture is known as porphyritic
Granite is an igneous rock, and it is formed from magma. Granitic magma has many potential origins, but it must intrude other rocks. Most granite intrusions are emplaced at depth within the crust, usually greater than 1.5 kilometers and up to 50 km depth within thick continental crust
A very hard mineral composed of silica, SiO2, found worldwide in many different types and colours of rocks, including sandstone and granite. Varieties of quartz include agate, chalcedony, chert, flint, opal, and rock crystal. There are many different varieties of quartz, several of which are precious gemstones. Throughout the world, varieties of quartz have been, since antiquity, the most commonly used minerals in the making of jewelry and hardstone carvings.
The word "quartz" is derived from the German word "quarz" and its Middle High German ancestor "twarc", which probably originated in Slavic.
Marble is a non-foliated metamorphic rock composed of recrystallized carbonate minerals, most commonly calcite or dolomite.
Geologists use the term "marble" to refer to metamorphosed limestone; however stonemasons use the term more broadly to encompass un-metamorphosed limestone.
Marble is commonly used for sculpture and as a building material.
The word "marble" derives from the Greek (mármaron), from (mármaros), "crystalline rock", "shining stone", perhaps from the verb (marmaírō), "to flash, sparkle, gleam". This stem is also the basis for the English word marmoreal, meaning "marble-like."