... 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
... . Spherulitic quartz nodules, likely secondary chalcedony , are rarely present and have a maximum dimension of .3 mm. Fossils ...
Raven Mueller - 2015-09-04