Where is Gem Silica, Chrysocolla Chalcedony, Blue Chalcedony with Chrysocolla found?
Chrysocolla (CuSiO3·nH2O) in Quartz (SiO2)
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Open the appGem Silica, Chrysocolla Chalcedony, Blue Chalcedony with Chrysocolla 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, Blue Chalcedony with Chrysocolla
Arizona, USA
Known for producing some of the finest 'Gem Silica' specimens, particularly from the Inspiration Mine (Miami-Globe district) and Ray Mine.
New Mexico, USA
Significant deposits, often associated with copper mining operations.
Peru
Produces high-quality chrysocolla in quartz, often with vibrant blue colors.
Chile
Associated with the extensive copper deposits in the Atacama Desert region.
Democratic Republic of Congo
Known for various copper minerals, including chrysocolla, which can occur in quartz.
Australia
Some occurrences in copper mining areas.
Collecting tips
- Geological Context. Look for this material in the oxidized zones of copper deposits, often near the surface where weathering processes have occurred. It will be found in veins, fractures, and as replacements in silica-rich host rocks.
- Associated Minerals. It is commonly found with other secondary copper minerals such as malachite, azurite, cuprite, native copper, and iron oxides.
- Color and Luster. Identify by its characteristic blue to blue-green color and vitreous to waxy luster. The presence of a harder, more stable matrix distinguishes it from pure chrysocolla.
- Hardness Test. While chrysocolla itself is soft (2.5-3.5), the quartz matrix significantly increases the overall hardness to 6.5-7 on the Mohs scale. This can be a key differentiator from pure chrysocolla.
Quick Check
- Color:
- Blue to blue-green
- Luster:
- Vitreous to waxy
- Streak:
- White (due to quartz dominance, pure chrysocolla has a white to pale blue streak)
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