Rock Identifier
Eagle Eye Stone (Green Tiger's Eye) (Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)) — mineral
mineral

Eagle Eye Stone (Green Tiger's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Hardness: 6.5-7 (Mohs scale); Color: Grayish-green to olive with silky chatoyancy; Luster: Silky to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.64-2.71

Hardness
6
Color
Grayish-green to olive with silky chatoyancy
Luster
Silky to vitreous
Identified More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App StoreGoogle Play

Physical properties

Hardness: 6.5-7 (Mohs scale); Color: Grayish-green to olive with silky chatoyancy; Luster: Silky to vitreous; Crystal structure: Trigonal/Microcrystalline; Cleavage: None; Specific Gravity: 2.64-2.71

Formation & geological history

Formed through a pseudomorphic process where silica (quartz) replaces the fibrous mineral crocidolite (blue asbestos) over millions of years. The green coloration typically occurs when the oxidation of iron is incomplete during the change from Hawk's Eye to Tiger's Eye.

Uses & applications

Used primarily for lapidary work, jewelry (cabochons and beads), carvings, and as a metaphysical 'protection' stone for collectors.

Geological facts

This specimen is a variety of chatoyant quartz. It is often considered a transitional phase between Hawk's Eye (blue) and the more common golden-brown Tiger's Eye. When polished, it exhibits a 'cat's eye' effect due to the reflection of light off its internal fiber structures.

Field identification & locations

Identify in the field by its distinctive 'moving' light bands (chatoyancy) and fibrous appearance despite having a smooth, hard surface. It is most commonly found in the Northern Cape Province of South Africa and Western Australia.

More like this

Other mineral specimens

Sandstone (with potential mineral staining/concretions) (Arenite (SiO2 based)) — sedimentary

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary
Epidote (Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) — metamorphic

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic
Nephrite Jade (Nephrite) — Mineral/Rock

Nephrite Jade

Nephrite

Mineral/Rock
Banded Gneiss (River Rock/Pebble) (Gneiss (specifically a banded variety often found as a river rock)) — Metamorphic Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock
Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

mineral
Epidote (Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)) — mineral

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

mineral