Where is Chrysocolla in Chert/Jasper found?
Chrysocolla (hydrated copper phyllosilicate) in Chert/Jasper (cryptocrystalline quartz)
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Open the appChrysocolla in Chert/Jasper 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 Chrysocolla in Chert/Jasper
Arizona, USA
Known for high-quality chrysocolla, including 'Gem Silica' in chert/jasper, particularly from copper mines like the Inspiration Mine and Ray Mine.
New Mexico, USA
Significant occurrences in copper mining districts.
Chile
Major copper-producing country with numerous chrysocolla occurrences.
Peru
Another significant source of copper minerals, including chrysocolla.
Democratic Republic of Congo
Known for various copper minerals, including chrysocolla.
Russia
Ural Mountains region has occurrences.
Israel
Eilat Stone, a mixture of chrysocolla, turquoise, malachite, and azurite, is found in the Timna Valley.
Collecting tips
- Look for Copper Deposits. Focus your search on areas known for copper mineralization, especially the oxidized zones of these deposits. Look for gossans (iron-rich weathered caps of ore bodies).
- Identify Associated Minerals. Chrysocolla often occurs with other secondary copper minerals like malachite (green), azurite (blue), cuprite (red), and native copper. The presence of these minerals can indicate chrysocolla.
- Examine Silica-Rich Rocks. Pay close attention to chert, jasper, and silicified sedimentary rocks in copper-bearing regions, as these are common host rocks for chrysocolla.
- Observe Color and Luster. The distinctive blue to blue-green color and waxy to vitreous luster are key indicators. Look for areas where the color is vibrant and evenly distributed within the cryptocrystalline matrix.
- Check Hardness. While pure chrysocolla is soft (2.5-3.5), chrysocolla in chert/jasper will be harder due to the quartz matrix (6.5-7 on Mohs scale). This can help differentiate it from softer copper minerals.
Quick Check
- Color:
- Blue to blue-green, often mottled with white, brown, or gray.
- Luster:
- Waxy to dull (chert/jasper), vitreous to greasy (chrysocolla-rich areas).
- Streak:
- White to very pale blue-green.
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