Where is Gem Silica, Chrysocolla Chalcedony found?
Hydrated copper phyllosilicate in Silicon dioxide
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Open the appGem Silica, Chrysocolla Chalcedony occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Gem Silica, Chrysocolla Chalcedony
Arizona, USA
Known for producing some of the finest 'Gem Silica' from mines such as the Inspiration Mine, Miami-Globe District, and Ray Mine. These localities are famous for their intense blue and blue-green material.
New Mexico, USA
Significant deposits, particularly in the southwestern part of the state, associated with porphyry copper systems.
Peru
Produces high-quality chrysocolla in quartz, often with vibrant colors and interesting patterns.
Chile
Major copper-producing country, with occurrences of chrysocolla in quartz in its extensive copper deposits.
Democratic Republic of Congo
Known for various copper minerals, including chrysocolla, which can be found intergrown with quartz.
Australia
Occurrences in copper mining regions, particularly in Queensland and Western Australia.
Collecting tips
- Geological Context. Focus your search in the oxidized zones (gossans) of known copper deposits or areas with historical copper mining activity. Look for areas with evidence of hydrothermal alteration.
- Associated Minerals. Chrysocolla in Quartz is often found alongside other secondary copper minerals like malachite (green), azurite (blue), cuprite (red), and native copper. The presence of these minerals can indicate a favorable environment.
- Color and Hardness. Look for distinctive blue to blue-green material. Test the hardness; if it scratches glass (Mohs 5.5-7), it's likely silicified chrysocolla rather than pure chrysocolla (Mohs 2-4).
- Fracture Patterns. Observe the fracture. Chrysocolla in Quartz typically exhibits a conchoidal to uneven fracture, characteristic of chalcedony.
- Field Equipment. Bring a rock hammer, chisel, safety glasses, and a hand lens. A hardness testing kit can be useful for distinguishing from pure chrysocolla.
Quick Check
- Color:
- Blue to blue-green
- Luster:
- Vitreous to waxy to dull
- Streak:
- White to very pale blue-green (for the quartz component; chrysocolla itself has a white to pale blue streak)
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