Sard
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
6.5 – 7.0
Specific Gravity
2.58 – 2.63
Refractive Index
1.535 – 1.539
Crystal System
Trigonal
Luster
Waxy,Resinous
Cleavage
None
Fracture
Conchoidal
Color
various
Birefringence
0.008
Pleochroism
Absent
Mohs Hardness
| Mohs | Reference mineral | Sard |
|---|---|---|
| 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 Sard
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.
Treatments
The color may be lightened by heat-treatment - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 7
6.5 to 7Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
2.58 to 2.63Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
NoneWalter Schumann, Gemstones of the world (2001)
ConchoidalArthur Thomas, Gemstones (2009)
1.535 to 1.539Herve Nicolas Lazzarelli, Blue Chart Gem Identification (2010)
Uniaxial/+Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
0.008 to 0.010Ulrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
AbsentWalter Schumann, Gemstones of the world (2001)
NoneWalter Schumann, Gemstones of the world (2001)
BrownUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004) More from other references
Translucent,OpaqueUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Waxy,ResinousArthur Thomas, Gemstones (2009)
TrigonalUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Fibrous to grained aggregateUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)
Sard information at mindat.org
About Sard
サードは玉髄（微晶質石英）の褐赤色から赤橙色の変種で、カーネリアンと異なる濃度の酸化鉄による温かみのある大地色が特徴です。古代ギリシャ・ローマでは印章彫刻やカメオの素材として広く使用され、古代世界で最重要な彫刻石のひとつと見なされていました。インド、ブラジル、ウルグアイの火山岩の空洞部が主要産地です。
On this page
Jewelry Use
Durability
6/10
Science FYI Family
Frequently Asked Questions
What is Sard?
サードは玉髄（微晶質石英）の褐赤色から赤橙色の変種で、カーネリアンと異なる濃度の酸化鉄による温かみのある大地色が特徴です。古代ギリシャ・ローマでは印章彫刻やカメオの素材として広く使用され、古代世界で最重要な彫刻石のひとつと見なされていました。インド、ブラジル、ウルグアイの火山岩の空洞部が主要産地です。
What is the hardness of Sard?
Sard has a Mohs hardness of 6.5 to 7.0, making it moderate for use in jewelry.
What color is Sard?
Sard is primarily Various.
How much does Sard cost?
Sard falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Sard?
Sard belongs to the Trigonal crystal system.