part of porphyry(deposit).
Diorites, rich in calcic ferro-magnesian
minerals are favorable for deposition.
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| Ray Mine, Ray, Arizona-Teapot Mountain | Chrysocolla (blue) in upper part of porphyry(deposit). |
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| Quartz veinules in a diorite. Diorites, rich in calcic ferro-magnesian minerals are favorable for deposition. | Oxidized copper veinules in the porphyry. |
Pictures used by permission.(Captions paraphrased by ovk.)
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