Encyclopedia
Granite
Granite is a very hard volcanic rock formed by the agglomeration of quartz crystals with feldspar and mica. The color varies (gray, green, pink, red, etc.) depending on the ratio of these three minerals and the presence of iron oxide or manganese oxide
Source: "Explanatory Notes to the Harmonized System of the Customs Tariff of the Russian Federation (HS Russia)" (prepared by the Federal Customs Service of Russia) (Volume 1, Sections I - VI, Groups 1 - 29)