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

Sunstone

Oligoclase (Plagioclase Feldspar) with inclusions - (Ca, Na)((Al, Si)4O8)

Hardness: 6-6.5 (Mohs scale); Color: Orange, reddish-brown, or yellow; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.62-2.67; Special trait: Aventurescence (metallic glitter caused by hematite or copper inclusions).

Hardness
6-6
Color
Orange, reddish-brown, or yellow
Luster
Vitreous to pearly
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Physical properties

Hardness: 6-6.5 (Mohs scale); Color: Orange, reddish-brown, or yellow; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.62-2.67; Special trait: Aventurescence (metallic glitter caused by hematite or copper inclusions).

Formation & geological history

Formed in igneous environments, typically within pegmatites and basaltic lava flows. The unique coloring and sparkle develop as the magma cools and trace elements like copper or hematite precipitate into tiny platelets. Geological ages range significantly depending on the deposit site.

Uses & applications

Primarily used as a gemstone in jewelry (rings, pendants, earrings) and as a decorative stone for collectors. It is also a popular specimen for metaphysical beliefs.

Geological facts

Sunstone is the official state gemstone of Oregon, USA, which is famous for producing high-quality specimens containing copper platelets. Historically, some believe it was used by Vikings for navigation (the 'Sunstone theory'), though this likely refers to Calcite or Iolite.

Field identification & locations

Identify in the field by looking for a 'schiller' effect or metallic flash when tilted under direct sunlight. Common locations include Oregon (USA), Norway, Tanzania, and India. Collectors should look for depth of color and the intensity of the metallic inclusions.

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