Sunstone (Aventurine feldspar)
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Sunstone owes its name to a sparkling optical effect called aventurescence, produced by reflections from aligned platelet inclusions of copper, hematite, or goethite suspended within the stone. It is a variety of feldspar, typically oligoclase or labradorite. Oregon sunstone, the official state gemstone of Oregon, contains native copper inclusions that yield colors ranging from pale yellow to deep red, while Scandinavian material shows a warm golden schiller. Its metallic, spangled brilliance and warm tones have made it a popular gem. With a Mohs hardness of 6 to 6.5, sunstone is moderately durable and is cut both as faceted stones and as cabochons that best display its shimmer.
Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
6.0 – 6.5
Specific Gravity
2.62 – 2.67
Refractive Index
1.525 – 1.552
Crystal System
Triclinic
Cleavage
Perfect
Fracture
Splintery
Color
various
Birefringence
0.007
Pleochroism
Weak or absent
Mohs Hardness
| Mohs | Reference mineral | Sunstone (Aventurine feldspar) |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | ● |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Moderate ($50-500/ct)
Where to Buy Sunstone (Aventurine feldspar)
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
About Sunstone (Aventurine feldspar)
日光石是一种砂金效应（冒险石闪光）长石，常见于拉长石或正长石中，其闪光效果由内部细小的赤铁矿、针铁矿或铜片反射光线所致。最珍贵的日光石产自美国俄勒冈州，呈特有的橙色至红色，部分含铜，还可呈现明亮的红色、绿色及双色效果。挪威、印度和坦桑尼亚也是重要产地，以温暖的橙金色调最为常见。
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Sunstone (Aventurine feldspar)?
日光石是一种砂金效应（冒险石闪光）长石，常见于拉长石或正长石中，其闪光效果由内部细小的赤铁矿、针铁矿或铜片反射光线所致。最珍贵的日光石产自美国俄勒冈州，呈特有的橙色至红色，部分含铜，还可呈现明亮的红色、绿色及双色效果。挪威、印度和坦桑尼亚也是重要产地，以温暖的橙金色调最为常见。
What is the hardness of Sunstone (Aventurine feldspar)?
Sunstone (Aventurine feldspar) has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Sunstone (Aventurine feldspar)?
Sunstone (Aventurine feldspar) is primarily Various.
How much does Sunstone (Aventurine feldspar) cost?
Sunstone (Aventurine feldspar) falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Sunstone (Aventurine feldspar)?
Sunstone (Aventurine feldspar) belongs to the Triclinic crystal system.