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  1. Rustic Buff

    ... but less than 1 percent of slide area. Quartz is often in chalcedony -fibrous forms as intergrowths within allochems. Extant voids ...

    Raven Mueller - 2015-07-23

  2. Hadrian

    ... . Spherulitic quartz nodules, likely secondary chalcedony , are rarely present and have a maximum dimension of .3 mm. Fossils ...

    Raven Mueller - 2015-09-04