metamorphic

Lapis lazuli rough

Lapis lazuli, a rock composed mainly of lazurite (Na₃CaAl₃Si₃O₁₂S) with calcite and commonly pyrite

AI-generated identification · may be incorrect

Deep blue bands in a pale calcite-rich matrix are visible. Lazurite has Mohs hardness 5–5.5 and a blue color with vitreous to dull luster; calcite is softer (3) and commonly cleaves well. Lapis is a rock, so it has no single crystal structure or specific gravity.

Identified October 7, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms by metamorphism of limestone or marble, where sulfur-bearing fluids produce lazurite. Major deposits, including Afghanistan’s Sar-e-Sang, are ancient; the specimen’s age cannot be determined from the image.

Uses & applications

Used for beads, carvings, ornamental objects, and historically as the source of ultramarine pigment. This rough piece is primarily suited to collecting or lapidary work.

Geological facts

The label appears to identify the piece as rough lapis lazuli and lists a price of $35. Blue color comes chiefly from lazurite; pyrite may occur as golden flecks, though none are clearly visible here.

Field identification & locations

Look for rich blue lazurite mixed with white calcite and occasional metallic pyrite; the specimen shows strong blue-and-white banding. Afghanistan, Chile, and Russia are notable sources.