Isle Royale National Park, Michigan. Specimen of Prehnite amygdules. Note the radiating fibrous structure with development of "eyes." Circa 1971.
Dates
Date Taken
1971
Summary
Isle Royale National Park, Michigan. Specimen of Prehnite amygdules. Note the radiating fibrous structure with development of "eyes." Circa 1971. Figure 74, U.S. Geological Survey Bulletin 1309.
Summary
Isle Royale National Park, Michigan. Specimen of Prehnite amygdules. Note the radiating fibrous structure with development of "eyes." Circa 1971. Figure 74, U.S. Geological Survey Bulletin 1309.
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