Green Gneiss

Hardness of 6-7 on the Mohs scale, predominantly green with dark black or biotite-rich bands, vitreous to dull luster, foliated crystal structure with distinct mineral banding, specific gravity around 2.6-2.9.

Formed under high-temperature and high-pressure metamorphic conditions, usually originating from regional metamorphism of igneous rocks like granite or sedimentary rocks like shale deep within the Earth's crust.

Used primarily as decorative stone, crushed stone for construction, architectural facings, and by rock collectors.

Gneiss rocks are among the oldest known rocks on Earth, with some formations dating back over 4 billion years.

Identified in the field by its characteristic alternating light and dark bands (gneissic banding) combined with a greenish coloration often imparted by epidote or chlorite minerals. Found globally in ancient shield regions and mountain belts.