What is Sunstone?
Sunstone is a member of the Feldspar family and is known for its spangled appearance, or sheen, caused by light interacting with tiny plate-like mineral inclusions within the stone. It’s primarily found in Norway, the United States, and India. Sunstone is often used as a gemstone and is a popular choice for jewelry due to its radiant, sun-like inclusions and spiritual significance.
Sunstone is a radiant gemstone known for its glittering, sun-like inclusions. Its warm hues and sparkling appearance make it a popular choice for jewelry and decorative items. The stone is often used in rings, necklaces, and pendants.
|Chemical Classification||Inorganic - Silicate (Feldspar)|
|Color||Ranges from orange to brownish-red, often with sparkling inclusions.|
|Luster||Vitreous to pearly.|
|Transparency||Transparent to translucent.|
|Occurrence||India, the United States (Oregon), and Norway.|
|Formation||Sunstone forms in magmatic and pegmatitic rock, and can also be found in alluvial deposits.|
|Diaphaneity||Transparent to translucent with aventurescence|
|Cleavage||Perfect in one direction|
|Mohs Hardness||6 to 6.5.|
|Diagnostic Properties||Aventurescence (sparkling or metallic glitter).|
|Pleochroism||Weak to distinct, depending on the stone.|
|Crystal System||Triclinic (variety of Feldspar)|
|Optical Properties||Biaxial (+)|
|Refractive Index||1.525 - 1.548|
|Birefringence||0.008 - 0.010|
|2V angle||Measured: 50° to 65°|
|Dispersion||Not typically noted for sunstone as it's not a key feature of this stone.|