Quartz
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
7.0
Specific Gravity
2.65
Refractive Index
1.544 – 1.553
Crystal System
Trigonal
Luster
Vitreous
Cleavage
None
Fracture
Conchoidal
Color
various
Birefringence
0.009
Dispersion
0.013
Pleochroism
Weakly dichroic
Mohs Hardness
| Mohs | Reference mineral | Quartz |
|---|---|---|
| 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 Quartz
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 Quartz
石英（クォーツ）は、地球の大陸地殻において最も豊富な単一鉱物で、アメシスト・シトリン・ローズクォーツ・スモーキークォーツ・水晶など非常に多彩な色と変種からなり、すべて二酸化ケイ素（SiO₂）で構成されています。硬度7の耐久性と多様な外観により、先史時代から道具・装身具・技術応用にいたるまで人類が最も活用してきた鉱物の一つです。石英結晶の圧電性は、時計・電子機器・精密計測器にも欠かせない特性となっています。
On this page
Jewelry Use
Durability
7/10
Suitable for daily wear
Science FYI Family
Frequently Asked Questions
What is Quartz?
石英（クォーツ）は、地球の大陸地殻において最も豊富な単一鉱物で、アメシスト・シトリン・ローズクォーツ・スモーキークォーツ・水晶など非常に多彩な色と変種からなり、すべて二酸化ケイ素（SiO₂）で構成されています。硬度7の耐久性と多様な外観により、先史時代から道具・装身具・技術応用にいたるまで人類が最も活用してきた鉱物の一つです。石英結晶の圧電性は、時計・電子機器・精密計測器にも欠かせない特性となっています。
What is the hardness of Quartz?
Quartz has a Mohs hardness of 7.0, making it excellent for use in jewelry.
What color is Quartz?
Quartz is primarily Various.
How much does Quartz cost?
Quartz falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Quartz?
Quartz belongs to the Trigonal crystal system.