Boulder Opal
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
5.0 – 6.5
Specific Gravity
1.98 – 2.25
Refractive Index
1.37 – 1.47
Crystal System
Amorphous
Luster
Vitreous
Cleavage
None
Fracture
Conchoidal
Color
white
Pleochroism
Absent
Mohs Hardness
| Mohs | Reference mineral | Boulder 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 Boulder 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 Boulder Opal
ボルダーオパールはオーストラリアのクイーンズランド州に固有の貴オパール変種で、鉄鉱石の母岩に薄い遊色オパールの層が形成された石です。母岩を残した独特のカット形状が特徴で、暗色の鉄鉱石がブラックオパールに似た背景として遊色を際立たせます。比較的手頃な価格でブラックオパールに匹敵する美しさを持つことで人気があります。
On this page
Jewelry Use
Durability
4/10
Science FYI Family
Frequently Asked Questions
What is Boulder Opal?
ボルダーオパールはオーストラリアのクイーンズランド州に固有の貴オパール変種で、鉄鉱石の母岩に薄い遊色オパールの層が形成された石です。母岩を残した独特のカット形状が特徴で、暗色の鉄鉱石がブラックオパールに似た背景として遊色を際立たせます。比較的手頃な価格でブラックオパールに匹敵する美しさを持つことで人気があります。
What is the hardness of Boulder Opal?
Boulder Opal has a Mohs hardness of 5.0 to 6.5, making it moderate for use in jewelry.
What color is Boulder Opal?
Boulder Opal is primarily White.
How much does Boulder Opal cost?
Boulder Opal falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Boulder Opal?
Boulder Opal belongs to the Amorphous crystal system.