Granite is an igneous rock and 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 kilometres and up to 50 km depth within thick continental crust

Granite is composed of mostly quartz and feldspar. The colors of granite are produced by the inclusion of different minerals in varying combinations. As this is a random process, variations in hue and pattern can occur even in the same granite deposit. This should be kept in mind when selecting your color.

Granite is broken down into 3 levels based on how common they are and has nothing to do with quality:
Level 1: is the most commonly occuring colors and therefore are the least expensive.
Level 2: is less common and has mid-range pricing.
Level 3: is the rarest and considered premium granite and has the price to match.