Rock & Mineral Encyclopedia

Search and identify 1,000+ rocks, minerals, crystals, and gemstones — with properties, formation, colors, hardness, and how to tell them apart.

Granite

A coarse-grained, speckled intrusive rock built from quartz, feldspar, and mica, forming the bedrock of the continents.

A rare granitic rock containing concentric, onion-like spheres called orbicules, prized as a striking ornamental stone.

A common coarse-grained intrusive rock like granite but richer in plagioclase than potassium feldspar.

A common rock-forming potassium feldspar, the Mohs hardness reference at 6, found in granites and used in ceramics and glassmaking.

Grandite is an intermediate garnet between grossular and andradite, common in skarns and prized for vivid green to golden crystals.