mineral

Sunstone

Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)

Hardness: 6-7 (Mohs scale); Color: Orange, peach, or red with metallic glitters; Luster: Vitreous to pearly; Crystal Structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.62-2.67

Hardness: 6-7 (Mohs scale)
Color: Orange, peach, or red with metallic glitters
Luster: Vitreous to pearly

Identified March 29, 2026More mineral →

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Physical properties

Formation & geological history

Formed in high-temperature igneous environments (lavas and pegmatites) or metamorphic rocks. Often found in basaltic flows. The distinctive 'schiller' effect comes from light reflecting off tiny platelets of hematite or copper (shiller effect).

Uses & applications

Primarily used in jewelry as cabochons, beads, or faceted stones. Also used in ornamental carvings and highly valued by metaphysical crystal collectors.

Geological facts

The metallic glitter seen in sunstone is called aventurescence. In ancient folklore, Vikings were said to use sunstone (or a similar 'sunstone') for navigation to locate the sun on cloudy days.

Field identification & locations

Identify by looking for 'schiller'—a metallic, glittery flash when rotated under light. Common locations include Oregon (USA), Norway, Tanzania, and India. Collectors should look for depth of color and the amount of sparkle/inclusions.