mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8
Mohs hardness 6 to 6.5, reddish-orange to golden brown with bright metallic schiller/aventurescence caused by hematite or copper inclusions. Vitreous to pearly luster, triclinic crystal system, two directions of cleavage at nearly 90 degrees.
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Physical properties
Mohs hardness 6 to 6.5, reddish-orange to golden brown with bright metallic schiller/aventurescence caused by hematite or copper inclusions. Vitreous to pearly luster, triclinic crystal system, two directions of cleavage at nearly 90 degrees.
Formation & geological history
Forms in igneous rocks like basalt and pegmatites through slow crystallization, allowing metallic mineral platelets (hematite or copper) to align and create the characteristic sparkling effect.
Uses & applications
Popular in lapidary work, wire-wrapped jewelry, cabochons, and gemstone collecting for its iridescent aventurescent flash.
Geological facts
The shimmering effect in sunstone is called 'aventurescence'. Oregon Sunstone is unique because its glittery inclusions are pure copper rather than hematite or goethite.
Field identification & locations
Identified by its distinctive orange-pink translucent base combined with tiny glittering internal reflections when rotated in light. Found in Oregon (USA), India, Norway, Canada, and Madagascar.
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sedimentary
Potassium Feldspar (Orthoclase)
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Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock