metamorphic

Zoisite with Hornblende

Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs), Color: Mottled forest green with black inclusions, Luster: Vitreous to pearly, Crystal structure: Orthorhombic, Cleavage: Perfect basal

Identified July 6, 2026More metamorphic →

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Physical properties

Hardness: 6-7 (Mohs), Color: Mottled forest green with black inclusions, Luster: Vitreous to pearly, Crystal structure: Orthorhombic, Cleavage: Perfect basal

Formation & geological history

Formed under regional metamorphism of igneous, sedimentary, or metamorphic rocks. Often found in medium to high-grade metamorphic rocks such as amphibolites or schists.

Uses & applications

Primarily used as a decorative stone, in lapidary work for cabochons and carvings, and as a low-cost gemstone for jewelry.

Geological facts

While famously known as the green matrix for Tanzanian Ruby-in-Zoisite (Anyolite), zoisite occurs widely in green forms with black hornblende needles without ruby.

Field identification & locations

The location (near Moscow, Russia) is primarily a sedimentary basin; finding a high-grade metamorphic zoisite here suggests it may be a 'glacial erratic' transported from the Kola Peninsula or Ural Mountains, or a polished landscaping stone.