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Dwarves' Earth Treasures Online Rock Shop:
Variscite
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.    It's common for variscite to come in massive form with varying shades of green commonly light green, and it's very rare for variscite to be in form of crystals. Variscite is considered a semi-percious stone, and often used by Native Americans especially Navajo to hand-make their silver jewelry.
    A classic example of variscite is those from Clay Canyon, Fairfield, Utah which was mined for its metals to be used to support World War II efforts. The variscite nodules from that mine were in process of being altered by water into crandette (yellow), wardite(gray), and a bunch of other rare minerals found nowhere else. I obtained several specimens from an old collection.
 

Clay Canyon, Fairfield, Utah, SLAB
Clay Canyon, Fairfield, Utah

Clay Canyon, Fairfield, Utah
Clay Canyon, Fairfield, Utah, SLAB
Crandette only, Clay Canyon, Fairfield, Utah
Lucin, Utah
Typical colors, Lucin, Utah In form of rare druzy crystals,
Avant, Arkansas
     Big aren't they? It was collected in 1938 from Clay Canyon, Fairfield, Utah as according to that white label on the specimen. I obtained that pair from an old collection. I'm wondering how rare is to see such a complete pair since I kept seeing just singles and slabs anywhere even in museums.
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For more information on classic variscite ("Utahlite") nodules, visit
http://www.mines.utah.edu/~jmarty/utah_minerals/clay_canyon.html