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
正长石是长石族矿物中最常见的碱性长石，化学式为KAlSi3O8，属单斜晶系，晶体解理呈直角（正交），因而得名。宝石级正长石通常呈黄色至黄绿色，透明，偶有猫眼效应；月光石即为正长石或冰长石（高温型正长石）的变种，以月光效应著称。正长石折射率1.518至1.526，双折射0.005至0.008，摩氏硬度6至6.5，有完全解理（两组）。产地包括马达加斯加（黄色刻面宝石）、缅甸、斯里兰卡（月光石）和美国。正长石是花岗岩、伟晶岩和流纹岩的主要组成矿物，地质上极为重要。
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Orthoclase?
正长石是长石族矿物中最常见的碱性长石，化学式为KAlSi3O8，属单斜晶系，晶体解理呈直角（正交），因而得名。宝石级正长石通常呈黄色至黄绿色，透明，偶有猫眼效应；月光石即为正长石或冰长石（高温型正长石）的变种，以月光效应著称。正长石折射率1.518至1.526，双折射0.005至0.008，摩氏硬度6至6.5，有完全解理（两组）。产地包括马达加斯加（黄色刻面宝石）、缅甸、斯里兰卡（月光石）和美国。正长石是花岗岩、伟晶岩和流纹岩的主要组成矿物，地质上极为重要。
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.