Rock Identifier
Copper-bearing Quartz (likely Chrysocolla or Malachite staining) (Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock) — mineral
mineral

Copper-bearing Quartz (likely Chrysocolla or Malachite staining)

Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock

Hardness: 2-4 (staining) to 7 (host quartz); Color: Cyan-blue, green, reddish-brown, and white; Luster: Dull to vitreous; Structure: Amorphous or microcrystalline; Cleavage: None.

Hardness
2-4 (staining) to 7 (host quartz)
Color
Cyan-blue, green, reddish-brown, and white
Luster
Dull to vitreous
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Physical properties

Hardness: 2-4 (staining) to 7 (host quartz); Color: Cyan-blue, green, reddish-brown, and white; Luster: Dull to vitreous; Structure: Amorphous or microcrystalline; Cleavage: None.

Formation & geological history

Secondary oxidation zone of copper ore deposits. Formed when copper-rich solutions interact with silica and oxygen in weathered rock environments. Common in arid climates.

Uses & applications

Major indicator for copper mining; used as decorative 'lapidary' rough for jewelry when high grade; historical source of copper pigment.

Geological facts

The blue-green color is a classic signature of copper oxidation, often referred to as 'copper bloom.' The reddish-brown areas represent Limonite or Cuprite, indicating a rich mineralized zone.

Field identification & locations

Identify by the vibrant blue-green staining against a harder rock matrix. Found in Arizona (USA), Congo, and Chile. Collectors look for solid color saturation and stability.

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