Gypsum
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Physical & Optical Properties
Category
Collector Gems
Mohs Hardness
2.0
Specific Gravity
2.2 – 2.4
Refractive Index
1.521 – 1.531
Crystal System
Monoclinic
Luster
Vitreous,Silky
Fracture
Uneven
Color
various
Birefringence
0.01
Pleochroism
Nil
Mohs Hardness
| Mohs | Reference mineral | Gypsum |
|---|---|---|
| 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 Gypsum
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About Gypsum
ジプサム（石膏）は、カルシウム硫酸塩水和物鉱物（CaSO₄·2H₂O）で、白色・無色・ピンク・黄色など様々な色を示します。「セレナイト」（透明板状）、「サテンスパー」（繊維状絹糸光沢）、「アラバスター」（細粒塊状）などの変種があります。非常に柔らかく（モース硬度2）、爪で傷つくほどです。
On this page
Jewelry Use
Durability
1/10
Science FYI Family
Frequently Asked Questions
What is Gypsum?
ジプサム（石膏）は、カルシウム硫酸塩水和物鉱物（CaSO₄·2H₂O）で、白色・無色・ピンク・黄色など様々な色を示します。「セレナイト」（透明板状）、「サテンスパー」（繊維状絹糸光沢）、「アラバスター」（細粒塊状）などの変種があります。非常に柔らかく（モース硬度2）、爪で傷つくほどです。
What is the hardness of Gypsum?
Gypsum has a Mohs hardness of 2.0, making it relatively soft for use in jewelry.
What color is Gypsum?
Gypsum is primarily Various.
How much does Gypsum cost?
Gypsum falls into the Budget (< $50/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Gypsum?
Gypsum belongs to the Monoclinic crystal system.