Common Opal
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
5.5 – 6.5
Specific Gravity
1.98 – 2.5
Refractive Index
1.37 – 1.52
Crystal System
Amorphous
Luster
Wood Opal
Cleavage
None
Fracture
Conchoidal,Splintery
Color
white
Pleochroism
Absent
Mohs Hardness
| Mohs | Reference mineral | Common Opal |
|---|---|---|
| 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
Budget (< $50/ct)
Where to Buy Common Opal
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 Common Opal
普通オパールは貴オパールを特徴づける遊色を持たない代わりに、均質な蝋状の外観を持つオパールです。ポテト・プラセンタス・ハイドロフェーン・メノウオパールなど多数の変種があり、世界各地で産出します。その不透明から半透明の乳白色や多彩な体色が装飾品として利用されます。遊色はなくても独自の美しさを持つ宝石です。
On this page
Jewelry Use
Durability
4/10
Science FYI Family
Frequently Asked Questions
What is Common Opal?
普通オパールは貴オパールを特徴づける遊色を持たない代わりに、均質な蝋状の外観を持つオパールです。ポテト・プラセンタス・ハイドロフェーン・メノウオパールなど多数の変種があり、世界各地で産出します。その不透明から半透明の乳白色や多彩な体色が装飾品として利用されます。遊色はなくても独自の美しさを持つ宝石です。
What is the hardness of Common Opal?
Common Opal has a Mohs hardness of 5.5 to 6.5, making it moderate for use in jewelry.
What color is Common Opal?
Common Opal is primarily White.
How much does Common Opal cost?
Common Opal falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Common Opal?
Common Opal belongs to the Amorphous crystal system.