Staurolite

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Physical & Optical Properties

Mohs Hardness 7.0 – 7.5
Specific Gravity 3.7 – 3.8
Refractive Index 1.736 – 1.762
Crystal System Monoclinic
Luster Vitreous
Cleavage Distinct
Fracture Sub-Conchoidal
Color various
Birefringence 0.01

Mohs Hardness

1 Talc 2 Gypsum 3 Calcite 4 Fluorite 5 Apatite 6 Orthoclase 7 Quartz 8 Topaz 9 Corundum 10 Diamond Staurolite
Mohs hardness of Staurolite shown against the ten reference minerals, from talc (1) to diamond (10).
Mohs Reference mineral Staurolite
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase
7 Quartz
8 Topaz
9 Corundum
10 Diamond

Crystal System

β a b c Monoclinic a ≠ b ≠ c, α = γ = 90°, β ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Staurolite

十字石是一种硅酸铁铝矿物,以其形成独特的十字形或X形双晶著称,这一特征使其在历史上被视为护身符,有时被称为"仙女十字石"或"圣十字石"。颜色从红棕色至暗棕色不等,具有较强的硬度。产自美国(弗吉尼亚州和北卡罗来纳州)、法国和苏格兰的变质岩中,十字形晶体常被制作成宗教饰品。

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Jewelry Use

Durability 7/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Staurolite?
十字石是一种硅酸铁铝矿物,以其形成独特的十字形或X形双晶著称,这一特征使其在历史上被视为护身符,有时被称为"仙女十字石"或"圣十字石"。颜色从红棕色至暗棕色不等,具有较强的硬度。产自美国(弗吉尼亚州和北卡罗来纳州)、法国和苏格兰的变质岩中,十字形晶体常被制作成宗教饰品。
What is the hardness of Staurolite?
Staurolite has a Mohs hardness of 7.0 to 7.5, making it excellent for use in jewelry.
What color is Staurolite?
Staurolite is primarily Various.
How much does Staurolite cost?
Staurolite falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Staurolite?
Staurolite belongs to the Monoclinic crystal system.

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