metamorphic
Polished blue spotted stone, likely K2 stone
K2 stone: granite containing blue azurite spots; quartz–feldspar–biotite matrix
AI-generated identification · may be incorrectHardness about 6–7 Mohs; blue-gray to white matrix with dark blue azurite inclusions, vitreous to slightly waxy luster, granular crystalline texture, and no obvious cleavage in the polished piece. The blue spots may also be dyed or another copper mineral, so confirmation requires testing.
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Physical properties
Hardness about 6–7 Mohs; blue-gray to white matrix with dark blue azurite inclusions, vitreous to slightly waxy luster, granular crystalline texture, and no obvious cleavage in the polished piece. The blue spots may also be dyed or another copper mineral, so confirmation requires testing.
Formation & geological history
K2 stone is quarried near Pakistan’s K2 region and formed as intrusive granite, generally Precambrian in age, later acquiring azurite mineralization in fractures or pockets. It is commonly cut and polished for lapidary use.
Uses & applications
Used for cabochons, beads, ornaments, and decorative objects; it is not generally used as a construction stone in this small polished form.
Geological facts
Its distinctive blue spotting is often marketed as “K2 jasper,” although it is not jasper and is geologically a granite-based rock. Azurite is a copper carbonate mineral that can occur with malachite.
Field identification & locations
Identify it by the pale granular granite matrix and irregular vivid-blue spots; a streak, hardness, magnification, and copper-mineral testing can help distinguish natural azurite from dye. Similar blue-dotted stones are sold under several trade names.
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