metamorphic
Blue sodalite-bearing rock, possibly lapis lazuli
Sodalite (Na₈Al₆Si₆O₂₄Cl₂), commonly in lazurite–calcite–pyrite assemblages
AI-generated identification · may be incorrectA coarse, opaque blue-and-white specimen with dark blue sodalite/lazurite, pale calcite, and rusty iron-stained areas; glassy to dull luster, uneven fracture, and approximate hardness 5–6. Exact identification requires testing, as the image cannot distinguish sodalite from lazurite confidently.
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Physical properties
A coarse, opaque blue-and-white specimen with dark blue sodalite/lazurite, pale calcite, and rusty iron-stained areas; glassy to dull luster, uneven fracture, and approximate hardness 5–6. Exact identification requires testing, as the image cannot distinguish sodalite from lazurite confidently.
Formation & geological history
Typically formed by contact or regional metamorphism of silica-poor, carbonate-rich rocks, often during Precambrian mountain-building; famous lapis deposits are about 600 million years old or older.
Uses & applications
Used as an ornamental stone, cabochon, carving material, pigment source, and collector specimen; lapis-quality material is used in jewelry and decorative objects.
Geological facts
Lapis lazuli is defined by abundant lazurite, while sodalite-rich material is generally paler and less valuable. White calcite veining and brassy pyrite commonly occur in lapis lazuli.
Field identification & locations
Look for royal-blue color, white calcite veins, and occasional metallic pyrite; a streak, hardness, and acid test can separate components, but laboratory analysis is needed for certainty. Common sources include Afghanistan, Chile, Canada, Russia, and Brazil.
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