Rock & Mineral Encyclopedia

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

Graphic Granite

A pegmatitic granite in which quartz and feldspar intergrow to resemble ancient runic or Hebrew script.

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

A Norwegian larvikite dimension stone prized for its shimmering blue iridescent feldspar crystals.

An altered granite mottled pink and green from feldspar and epidote, popular as a tough, colorful ornamental rock.

A distinctive tourmaline-rich granite from Cornwall, prized as an ornamental stone for its pink feldspar set with radiating black tourmaline.

An altered granite of pink feldspar, green epidote and quartz, mottled pink-and-green and popular as a tumbled and carving stone.

A Norwegian intrusive rock whose feldspar crystals flash silvery-blue, widely used as blue pearl granite countertops.

A pegmatite rock of feldspar intergrown with wedge-shaped quartz that resembles ancient runic or Hebrew writing.

A banded, porous limestone deposited by mineral springs, prized as a warm-toned natural building and tile stone.

A soft, porous limestone made of loosely cemented shell and coral fragments, used as a coastal building stone.