Purple quartz with shades that can run from pale lilac to deep violet.

Pale blue to greenish-blue beryl, often with long, six-sided crystal forms.

Dark volcanic glass with a glossy surface and curved fractures.

An inky tourmaline often sold under its mineral name, schorl.

A translucent orange to reddish-brown variety of chalcedony.

Yellow to brownish-orange quartz. Heat-treated material is common.

Colorless quartz, also called rock crystal.

A soft mineral that can form neat cubes in several colors.

A family of minerals that includes deep red almandine as well as orange and green gems.

Green quartz with tiny mica flakes that can sparkle when you turn it in the light.

An iron oxide that can look metallic gray, black, or earthy red.

A feldspar that can flash blue, green or gold as it turns in the light.

A rich blue rock that may show gold-colored pyrite and pale calcite.

A vivid green copper mineral known for its rings and alternating bands.

A feldspar with a soft sheen that seems to move under its surface.

A brassy iron sulfide that often grows in sharply defined cubes.

Pink quartz, often softly cloudy rather than fully transparent.

A transparent or translucent crystalline variety of gypsum.

Gray to brown quartz that can range from lightly tinted to nearly black.

A golden-brown quartz material with a moving band of light.

An opaque blue to green mineral that can carry veins of its host rock.