Glass (Cat's-Eye) | Gemopedia

The term cat's eye, or chatoyancy, is used to describe a phenomenal optical property in gemstones, in this case man-made glass. The effect, when present, appears as a bright, narrow slit similar to the pupils in the eyes of your favorite feline. This phenomenon is caused by parallel fibrous or needle-like inclusions that interfere with the passage of light through the crystal, scattering and reflecting light back to the viewer as a thin line. Although in this case the phenomenon is not natural, it offers an affordable alternative to this rare phenomenon seen with some natural gems.
Alternate
Names
Cathaystone, Catseyte, Fiber-Eye
Colors
Can Be Any Color

Glass (Cat's-Eye) Classification

Common Name

Glass (Cat's-Eye)

Species

NA

Variety

Colors

Can Be Any Color

Alternate Names

Cathaystone, Catseyte, Fiber-Eye

Gemstone Groups

Key Separations

magnification and apperance

Comments

Cat's-eye glass is made up of bundles of parallel optic fibers.

Glass (Cat's-Eye) Optical Properties

Transparency

Semitranslucent - Opaque

Refractive Index

1.7-1.47
Tolerance:can be OTL

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV: Varible
LWUV: Varible

CCF Reaction

Pleochroism

None

Dispersion

Comments

Glass (Cat's-Eye) Chemistry & Crystallography

Chemical Name

Silica

Chemical Formula

Synthesis

Crystal System

NA

Classification

Nature

Simulant

Crystallinity

Non-Crystalline

Comments

Glass (Cat's-Eye) Characteristic Physical Properties

Hardness

5-6

Streak

Specific Gravity

2.3-4.5

Toughness

Poor

Inclusions

Cat's-eye glass will have a honeycomb structure when viewed from the side if the cabochon. Stones might have gas bubbles, swirl marks, flow lines or a reflective base.

Luster

Vitreous

Stability

Fracture

Conchoidal, Granular, Splintery

Cleavage

None

Comments

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