Granite (specifically the Ubatuba variety)

Physical Properties

Hardness: 6-7 on Mohs scale. Color: Dark green to black with gold, brown, and gray flecks. Luster: Vitreous to pearly (due to mica/labradorite). Crystal structure: Phaneritic (coarse-grained). Cleavage: Varies by mineral (feldspar has perfect cleavage).

Formation & Geological History

Formed from the slow cooling and crystallization of molten magma deep beneath the Earth's surface (plutonic). This specific commercial variety is often Precambrian in age.

Uses & Applications

Primarily used as a decorative dimension stone for kitchen countertops, flooring, and tiling due to its high durability and aesthetic appeal.

Geological Facts

Commercial 'granite' like Ubatuba is often technically a charnockite or granodiorite. It contains significant amounts of potassium feldspar, quartz, and pyroxene.

Field Identification & Locations

Identify by its interlocking crystal grains and high hardness (will scratch glass). Commonly quarried in Brazil (state of Espírito Santo). Professional installers look for uniform grain distribution.

Identified on: 4/25/2026

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