Sunstone

Hardness: 6-6.5 (Mohs); Color: Reddish-orange with metallic flashes; Luster: Vitreous to sub-metallic; Crystal Structure: Triclinic; Cleavage: Perfect in two directions.

Formed in igneous environments, particularly lavas like basalt. Its characteristic shimmer (aventurescence) is caused by tiny inclusions of copper or hematite plates. The coordinates 43.4N, 40E (Western Caucasus region) are geologically complex and include volcanic and metamorphic formations where feldspars are common.

Primarily used as a gemstone for jewelry (cabochons or beads) and as a metabolic or holistic stone in metaphysical circles.

The shimmering effect is called aventurescence. Some ancient cultures believed sunstones could navigate the seas by polarizing light, often associated with the 'Viking Sunstone' although that was likely calcite.

Identify in the field by its distinct metallic 'glitter' when rotated under light, a property called schiller. Common in Norway, India, and Oregon, USA.