Rock & Mineral Encyclopedia

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

Cat's Eye Moonstone

A moonstone variety displaying a moving band of light (chatoyancy) across its surface in addition to the classic moonstone glow.

A pale green variety of feldspar moonstone showing a soft white or bluish adularescent sheen over a greenish body.

A smoky gray feldspar moonstone, often called new moon stone, showing a silvery-blue adularescent sheen over a translucent gray body.

A hard, dark, poorly sorted sandstone with a muddy matrix, typically deposited by underwater turbidity currents.

Natural volcanic glass speckled with embedded mineral crystals (phenocrysts) such as feldspar or cristobalite that grew before the lava chilled.

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

A dark gray-to-black feldspar variety of moonstone that shows blue and white adularescent flash against a smoky body.

A spotted jasper-rhyolite patterned with leopard-like rings and ovals, valued as an earthy ornamental and lapidary stone.

A high-grade metamorphic rock formed in the deep, hot crust, marked by anhydrous minerals like pyroxene and garnet.

A cream-colored spotted stone resembling a Dalmatian dog, made of feldspar and quartz dotted with dark mineral grains.