Ruby Zoisite

Physical Properties

Hardness: 6-7 (Zoisite) to 9 (Ruby); Color: Bright green with purplish-red inclusions and black specks; Luster: Vitreous to dull; Crystal structure: Orthorhombic (Zoisite) and Trigonal (Ruby); Specific Gravity: 3.35

Formation & Geological History

Formed through regional metamorphism of magnesium-rich rocks. It is primarily found in the Merelani Hills of Tanzania, originating from the Neoproterozoic era.

Uses & Applications

Mostly used for ornamental carvings, cabochons for jewelry, and as a popular collector's specimen.

Geological Facts

Known as 'Anyolite', derived from the Maasai word 'anyoli' meaning green. The black specks are typically the mineral Tschermakite (a type of pargasite/hornblende).

Field Identification & Locations

Identify by the high-contrast combination of pistachio-green zoisite and opaque red ruby crystals. Primarily found in Tanzania; look for the characteristic black amphibole spots which distinguish it from ruby in fuchsite.

Identified on: 4/15/2026

Mode: Standard