Sunstone
Feldspar group, Plagioclase series var. Sunstone · Semi-Precious Gemstone
Crystal System
Triclinic, typically massive or tumbled into an ovoid shape in this specimen
Mineral Group
Silicates (Tectosilicate)
Chemical Formula
(Na,Ca)(Al,Si)4O8 with inclusions of hematite or goethite
Formation Process
Igneous and metamorphic formation, crystallizing from cooling magma or within pegmatites and basaltic lava flows, often with platy hematite inclusions exsolving during cooling.
About This Crystal
A tumbled, polished ovoid gemstone displaying a warm, brownish-pink to peachy-orange body color with internal shimmering reddish-brown metallic flecks caused by tiny platelet inclusions.
Physical Characteristics
Color ranges from pink, peach, to reddish-brown; white streak; two distinct cleavage planes intersecting at approximately 86 degrees; uneven to conchoidal fracture; specific gravity around 2.62 to 2.76; brittle tenacity.
Optical Properties
Biaxial with low birefringence; exhibits aventurescence (a spangled, metallic glitter effect caused by light reflecting off microscopic mineral platelets suspended within the stone).
Hardness & Durability
Origin Region
Found in India, Norway, Russia, and the United States (Oregon). Typically forms in igneous rocks like basalts and granitic pegmatites.
Hardness & Durability
Mohs hardness of 6 to 6.5; moderate durability; good for pendants and earrings, but requires protective settings for rings due to distinct cleavage.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals, ultrasonic cleaners, and steam cleaners; store separately from harder gems to prevent scratching.
Rarity & Value
Common to Uncommon; value depends on intensity of body color, transparency, and the density and sparkle of the aventurescence; typically affordable unless originating from high-grade Oregon or Norwegian deposits.
Special Characteristics
Aventurescence, caused by the reflection of light from microscopic copper, hematite, or goethite platelets aligned within the feldspar matrix.
Lore & History
Historically associated with light, sun gods, and abundance; used in Viking navigation lore according to traditional tales; tied to the sacral and solar plexus chakras in modern crystal healing to promote leadership, joy, and vitality (traditional belief, not scientific).