Orthoclase
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Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
6.0
Specific Gravity
2.54 – 2.61
Refractive Index
1.518 – 1.536
Crystal System
Monoclinic
Luster
Vitreous,Pearly
Color
various
Birefringence
0.005
Pleochroism
Weak
Mohs Hardness
| Mohs | Reference mineral | Orthoclase |
|---|---|---|
| 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 Orthoclase
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 Orthoclase
正長石（オーソクレース）は、カリウムアルミノケイ酸塩のアルカリ長石で、無色・白・クリーム・黄・橙色の板状〜プリズム状結晶を形成し、ガラス光沢を持ちます。カリ長石の最も一般的な多形の一つで、花崗岩・流紋岩・ペグマタイトに広く産し、アドラレセンスを示す透明〜半透明の変種はムーンストーンとして知られています。切り石向けの黄色・無色透明な正長石はマダガスカルやミャンマーに産し、コレクター宝石として入手できます。
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Orthoclase?
正長石（オーソクレース）は、カリウムアルミノケイ酸塩のアルカリ長石で、無色・白・クリーム・黄・橙色の板状〜プリズム状結晶を形成し、ガラス光沢を持ちます。カリ長石の最も一般的な多形の一つで、花崗岩・流紋岩・ペグマタイトに広く産し、アドラレセンスを示す透明〜半透明の変種はムーンストーンとして知られています。切り石向けの黄色・無色透明な正長石はマダガスカルやミャンマーに産し、コレクター宝石として入手できます。
What is the hardness of Orthoclase?
Orthoclase has a Mohs hardness of 6.0, making it moderate for use in jewelry.
What color is Orthoclase?
Orthoclase is primarily Various.
How much does Orthoclase cost?
Orthoclase falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Orthoclase?
Orthoclase belongs to the Monoclinic crystal system.