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
砾石蛋白石是澳大利亚昆士兰州特产的独特蛋白石品种，其中宝石质蛋白石充填于铁岩砾石的裂缝中，形成天然的铁质基底衬托下的变彩效果。与其他蛋白石不同，砾石蛋白石通常保留部分铁岩母岩，形成天然的深色背景，使变彩更为鲜艳绚丽。昆士兰州的温顿和鲍洼地区是主要产地。
On this page
Jewelry Use
Durability
4/10
Science FYI Family
Frequently Asked Questions
What is Boulder Opal?
砾石蛋白石是澳大利亚昆士兰州特产的独特蛋白石品种，其中宝石质蛋白石充填于铁岩砾石的裂缝中，形成天然的铁质基底衬托下的变彩效果。与其他蛋白石不同，砾石蛋白石通常保留部分铁岩母岩，形成天然的深色背景，使变彩更为鲜艳绚丽。昆士兰州的温顿和鲍洼地区是主要产地。
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.