| Description |
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| Comments: | Occurs in quartz-graphite schist. |
| Quality of samples: | not specified / average specimens |
| Confirmation |
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| Validity: | Believed Valid |
| References |
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| References: | Snetsinger, K.G. (1966) Barium-vanadium muscovite and vanadium tourmaline from Mariposa County, California. American Mineralogist: 51: 1623-1639; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 425-426, 503. |
| Data |
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| Mineral Data: | Click here to view Graphite data |
| Locality Data: | Click here to view Silver Knob, Fish Camp, Yosemite Valley, Mariposa Co., California, USA |