Ruby-Zoisite

Rock

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV (retired)
Published: June 2014
Modified: September 2023
Ruby-Zoisite Polished Ruby-Zoisite Rough Ruby-Zoisite Jewelry

Ruby in zoisite is a translucent to opaque rock composed of ruby crystals, green zoisite and black hornblende. The official name for this gem is "anyolite," from the Masai word anyoli, meaning "green." This gem is usually used as an ornamental stone due to its stunning color contrasts.

General Information

Common Name
Ruby-Zoisite
Species
Rock
Transparency
Translucent - Opaque
Dispersion
Strength: None
Refractive Index
1.700-1.770 Tolerance: Red areas 1.760-1.770 Green 1.700
Optic Character
NA
Optic Sign
NA
Polariscope Reaction
Aggregate (AGG)
Fluorescence
SWUV: Inert
LWUV: Inert
Pleochroism
None
Hardness
6-9
Specific Gravity
3.100-3.400
Inclusions
Ruby areas might show hexagonal outline.
Luster
Vitreous, Pearly
Fracture
Uneven
Cleavage
None
Chemical Name
aluminum oxide and calcium aluminum silicate hydroxide
Chemical Formula
Al2O3 and Ca2Al3(SiO4)3(OH)
Crystal System
NA
Chemistry Classification
Rock

Ruby-Zoisite Colors

  • Bi-color Ruby-Zoisite
    Bi-color
  • Green Ruby-Zoisite
    Green
  • Multi-color Ruby-Zoisite
    Multi-color
  • Red Ruby-Zoisite
    Red

Alternate Names

Anyolite

Countries of Origin

Tanzania, United Republic Of; Unknown

Care

Normal Care, avoid ultrasonic and harsh cleaners if oiled.