mineral
Blue-green copper mineral specimen, likely chrysocolla-bearing rock
Chrysocolla, hydrated copper silicate: approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; possibly mixed with quartz or turquoise
AI-generated identification · may be incorrectTurquoise-blue to green, dull to waxy luster, opaque, irregular massive texture, and no visible cleavage; Mohs hardness is typically 2.5–4, though quartz-rich material is harder. The specimen’s rough, botryoidal-looking surface and copper coloration support a chrysocolla-rich identification, but exact identification re…
Identified More mineral →
Explore Blue-green copper mineral specimen, likely chrysocolla-bearing rock in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Turquoise-blue to green, dull to waxy luster, opaque, irregular massive texture, and no visible cleavage; Mohs hardness is typically 2.5–4, though quartz-rich material is harder. The specimen’s rough, botryoidal-looking surface and copper coloration support a chrysocolla-rich identification, but exact identification requires testing.
Formation & geological history
Forms as a secondary copper-ore mineral in oxidized zones above copper deposits, commonly replacing or coating host rock. It is generally geologically young relative to its host deposit, forming during weathering and groundwater alteration.
Uses & applications
Used as a lapidary stone, cabochon, ornamental material, and copper-ore indicator; softer pieces are often stabilized with resin for jewelry. It has limited construction value.
Geological facts
Chrysocolla commonly occurs with malachite, azurite, cuprite, limonite, and quartz, producing attractive blue-green patterns. Similar-looking turquoise, dyed quartz, and chrysocolla-quartz composites are common commercial alternatives.
Field identification & locations
Look for blue-green color, low hardness, earthy-to-waxy luster, and association with other copper minerals; it may scratch with a steel knife. Common localities include Arizona, Nevada, Chile, Peru, Mexico, and the Democratic Republic of the Congo.
