igneous
K2 granite (azurite-in-granite)
Granite containing blue azurite spots; granite is mainly quartz, feldspar, and mica, with minor azurite (Cu₃(CO₃)₂(OH)₂).
AI-generated identification · may be incorrectThe rounded specimen has a pale blue-green groundmass with irregular black-and-white patches. Granite is typically Mohs 6–7, nonmetallic, and coarse-grained; the image does not resolve crystal structure or cleavage clearly.
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Physical properties
The rounded specimen has a pale blue-green groundmass with irregular black-and-white patches. Granite is typically Mohs 6–7, nonmetallic, and coarse-grained; the image does not resolve crystal structure or cleavage clearly.
Formation & geological history
Granite crystallizes slowly from magma underground; the blue spots are generally attributed to azurite formed by later copper-bearing fluids. K2 material comes from the Karakoram region and is associated with ancient intrusive rocks.
Uses & applications
Mostly sold as a decorative lapidary stone, polished cabochon, or collector specimen; it is not commonly used as building stone.
Geological facts
Despite its trade name, K2 stone is not from the K2 mountain summit; it is named for the nearby mountain and is sometimes marketed as “K2 jasper,” though it is granite.
Field identification & locations
Identify it by bright blue patches on a pale, speckled granite matrix; genuine blue patches are usually sparse and irregular. K2 granite is reported from Pakistan’s Skardu area.
