mineral
Chrysocolla in Malachite
Cu2CO3(OH)2 (Malachite) / Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
Hardness: 2-4 (Chrysocolla) to 3.5-4 (Malachite); Color: Vibrant green banding with cyan to deep blue patches; Luster: Vitreous to sub-adamantine (Malachite) or waxy/dull (Chrysocolla); Crystal Structure: Monoclinic (Malachite) / Amorphous (Chrysocolla); Specific Gravity: 2.0-4.0.
- Hardness
- 2-4 (Chrysocolla) to 3
- Color
- Vibrant green banding with cyan to deep blue patches
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Physical properties
Hardness: 2-4 (Chrysocolla) to 3.5-4 (Malachite); Color: Vibrant green banding with cyan to deep blue patches; Luster: Vitreous to sub-adamantine (Malachite) or waxy/dull (Chrysocolla); Crystal Structure: Monoclinic (Malachite) / Amorphous (Chrysocolla); Specific Gravity: 2.0-4.0.
Formation & geological history
Secondary mineral formed in the oxidation zones of copper ore deposits. Surface water reacts with copper-bearing minerals to precipitate these carbonates and silicates, often in stalactitic or botryoidal forms.
Uses & applications
Primarily used as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular collector's specimen. Historically used as a minor copper ore.
Geological facts
Malachite was used as a cosmetic pigment in ancient Egypt for eye shadow. When intergrown with Chrysocolla, the resulting stone is often called 'Eilat Stone' if sourced from Israel, though commonly found in the Congo and Arizona.
Field identification & locations
Identify by the distinctive 'eye-like' banding of green Malachite interspersed with the bright blue of Chrysocolla. Found near copper mines in DR Congo, Namibia, and the Southwestern USA. Collectors should watch for synthetic imitations made of resin or ceramic.
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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Metamorphic Rock
![Green Apatite on Albite (Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]) — mineral](https://media.rockidentification.com/2391a63f-fb20-47d5-af9a-2035851eb32e-thumbnail.jpg)
Green Apatite on Albite
Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]
mineral