igneous
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
Hardness: 6-7 (Granite matrix) / 3.5-4 (Azurite); Color: White to grey base with bright blue spherical spots and black mottling; Luster: Vitreous to dull; Crystal structure: Monoclinic (Azurite inclusions); Specific gravity: 2.6-2.7
- Hardness
- 6-7 (Granite matrix) / 3
- Luster
- Vitreous to dull
Identified More igneous →
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Physical properties
Hardness: 6-7 (Granite matrix) / 3.5-4 (Azurite); Color: White to grey base with bright blue spherical spots and black mottling; Luster: Vitreous to dull; Crystal structure: Monoclinic (Azurite inclusions); Specific gravity: 2.6-2.7
Formation & geological history
Formed as a plutonic igneous rock (granite) that underwent secondary mineralization where copper-rich fluids deposited azurite into the crystalline structure. Found specifically at the base of the K2 mountain in the Karakoram Range.
Uses & applications
Primarily used for lapidary work, including cabochons, tumbled stones, jewelry, and as a decorative specimen for crystal collectors.
Geological facts
Despite its common trade name 'K2 Jasper', it is not actually a jasper (which is sedimentary/microcrystalline quartz) but is a granite. It is one of the few places on Earth where azurite is found hosted within a granite matrix.
Field identification & locations
Identify by the distinct bright blue 'ink-like' spots of azurite on a salt-and-pepper granite background. It is currently only known to be found in the Skardu area of northern Pakistan near the world's second-highest peak.
