Falcon's Eye

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Physical & Optical Properties

Mohs Hardness 7.0
Specific Gravity 2.58 – 2.64
Refractive Index 1.534 – 1.54
Crystal System Trigonal
Luster Silky
Cleavage None
Fracture Irregular
Color various
Pleochroism Absent

Mohs Hardness

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

Crystal System

a a a Trigonal (Rhombohedral) a = b = c, α = β = γ ≠ 90°

Value & Market

Price Tier Moderate ($50-500/ct)

About Falcon's Eye

ファルコンズアイ(ホークスアイ)は、青灰色から青緑色のシャトヤンシー効果(キャッツアイ効果)を示す石英の変種です。クロシドライト(青石綿)が石英に置換されて形成されたもので、繊維状構造が光を反射して鷹の目のような光の帯を生じます。南アフリカが主要産地です。

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Jewelry Use

Durability 7/10

Suitable for daily wear

Science FYI Family

Frequently Asked Questions

What is Falcon's Eye?
ファルコンズアイ(ホークスアイ)は、青灰色から青緑色のシャトヤンシー効果(キャッツアイ効果)を示す石英の変種です。クロシドライト(青石綿)が石英に置換されて形成されたもので、繊維状構造が光を反射して鷹の目のような光の帯を生じます。南アフリカが主要産地です。
What is the hardness of Falcon's Eye?
Falcon's Eye has a Mohs hardness of 7.0, making it excellent for use in jewelry.
What color is Falcon's Eye?
Falcon's Eye is primarily Various.
How much does Falcon's Eye cost?
Falcon's Eye falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.
What is the crystal system of Falcon's Eye?
Falcon's Eye belongs to the Trigonal crystal system.

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