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Dwarves' Earth Treasures Museum:
Coldwater Agates
Vinton, Iowa
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     Coming in a form of sedimentary chert concertions, the agates of Coldwater Quarry at Vinton are white to gray and it is not known wether they had any colors at all. It appears that they share the same limestone formation as those of Union Road agates from south of St. Louis, Missouri. It said that they were available only for a short time during the quarrying of limestone before it was closed few years later.

Rough Appearance: Yellowish-tan chert concerntions sometimes with white agate showing.
Can be confused with Union Road Agates except that Union Road Agates are always more colorful.

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