Rock Identifier
Chrysocolla-bearing copper ore (Chrysocolla, hydrated copper aluminosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely mixed with copper oxides and quartz/matrix minerals) — mineral
mineral

Chrysocolla-bearing copper ore

Chrysocolla, hydrated copper aluminosilicate (approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O), likely mixed with copper oxides and quartz/matrix minerals

AI-generated identification · may be incorrect

Blue-green to turquoise, typically earthy to waxy or dull luster, botryoidal or massive rather than well-crystallized; Mohs hardness about 2.5–3.5, no prominent cleavage, specific gravity roughly 1.9–2.4. The brown material is likely iron-stained host rock or limonite.

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Physical properties

Blue-green to turquoise, typically earthy to waxy or dull luster, botryoidal or massive rather than well-crystallized; Mohs hardness about 2.5–3.5, no prominent cleavage, specific gravity roughly 1.9–2.4. The brown material is likely iron-stained host rock or limonite.

Formation & geological history

Forms as a secondary copper mineral in the oxidized zones of copper deposits, where acidic groundwater alters primary sulfides; commonly associated with malachite, azurite, cuprite, quartz, and limonite. Deposits range from ancient to geologically recent.

Uses & applications

Used as a collectible mineral and occasionally cut into cabochons or beads; softer material is usually stabilized with resin. Copper ores containing chrysocolla may be economically mined, but this specimen is primarily ornamental.

Geological facts

Its vivid color can resemble turquoise, but chrysocolla is generally softer and less durable. Silica-rich varieties may be hard enough for jewelry, while pure massive material scratches easily.

Field identification & locations

Identify by the intense blue-green color, earthy texture, softness, and association with brown iron oxides or other copper minerals; common localities include Arizona, Nevada, Chile, Peru, the Democratic Republic of Congo, and Australia.