Sunstone
Feldspar group, Plagioclase series (Oligoclase / Aventurine Feldspar) · Semi-Precious Gemstone
Crystal System
Triclinic, typically massive to platy or tabular habit in raw form, presented here as a tumbled and polished pebble
Mineral Group
Silicates, specifically Tectosilicates (Feldspar group)
Chemical Formula
(Na,Ca)(Al,Si)4O8 with copper (Cu) platelets or hematite/goethite inclusions
Formation Process
Igneous and magmatic crystallization within volcanic rocks, pegmatites, or basaltic lava flows where micro-platelets of copper or hematite exsolve during cooling
About This Crystal
A tumbled, smooth, rounded specimen displaying a warm peach-orange and creamy white base color with characteristic shimmering, metallic copper spangles or aventurescence caused by microscopic reflective inclusions
Physical Characteristics
Color: Peach, orange, reddish-brown, and white with metallic glittering inclusions. Streak: White. Cleavage: Perfect in two directions intersecting at nearly 90 degrees. Fracture: Uneven to conchoidal. Specific Gravity: 2.64 to 2.68. Tenacity: Brittle
Optical Properties
Biaxial with a refractive index ranging between 1.533 and 1.552. Exhibits aventurescence, a spangled metallic glitter caused by light reflecting off internal flat platelets of copper or hematite
Hardness & Durability
Origin Region
Notable sources include Oregon (USA), Norway, India, Russia, and Madagascar, typically found in basalt flows or igneous rocks
Hardness & Durability
Mohs hardness of 6 to 6.5. Moderate toughness, sensitive to sharp blows due to distinct cleavage planes, suitable for pendants, earrings, and rings with protective settings
Care & Maintenance
Clean with warm soapy water and a soft cloth. Avoid ultrasonic cleaners, steam cleaners, and harsh chemical solvents. Store separately from harder gemstones to prevent scratching
Rarity & Value
Uncommon to Rare depending on the intensity of the aventurescence and clarity. High-grade Oregon sunstones with strong red or green body colors and heavy copper Schiller can command high collector prices, while standard tumbled stones are affordable
Special Characteristics
Aventurescence (Schiller effect), creating a glittering metallic reflection from tiny aligned platelets suspended within the feldspar matrix
Lore & History
Historically associated with the sun and solar deities across various ancient cultures, used by Viking navigators in ancient lore as a navigational compass. In modern crystal healing, it is linked to the Sacral and Solar Plexus chakras, symbolizing vitality, leadership, joy, and personal power, though these are traditional beliefs