Rock Identifier
Sunstone (Plagioclase Feldspar (Na,Ca)(Al,Si)4O8) — mineral
mineral

Sunstone

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

Hardness: 6-6.5 on Mohs scale; Color: Orange, reddish-brown, or gold with metallic schiller; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.62-2.67

Hardness
6-6
Color
Orange, reddish-brown, or gold with metallic schiller
Luster
Vitreous to pearly
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Physical properties

Hardness: 6-6.5 on Mohs scale; Color: Orange, reddish-brown, or gold with metallic schiller; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific Gravity: 2.62-2.67

Formation & geological history

Formed in igneous environments, specifically in lava flows (basalt) or pegmatites. The metallic 'glitter' is caused by tiny inclusions of copper, hematite, or goethite. Famous deposits include the Oregon Sunstone from the Tertiary period.

Uses & applications

Primarily used as a gemstone in jewelry (earrings, rings, pendants) and as a collector's mineral specimen.

Geological facts

Oregon Sunstone is the official state gemstone of Oregon. The 'shiller' or aventurescence effect is what makes it unique, caused by light reflecting off internal copper platelets.

Field identification & locations

Identify by its unique aventurescence (metallic glitter). Common locations include Oregon (USA), Norway, Tanzania, and India. In the field, look for feldspar cleavage combined with flashes of reddish-orange color.

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