Mineral: Quartz (variety chalcedony) with iron oxides
Locality: Monroe County, Indiana, USA
Dimensions: from about 8 cm to 13 cm

Description: microcrystalline quartz (chalcedony) variously stained with iron oxides Monroe County, Indiana Not otherwise specified. All were found opened and just needed simple soapy water cleaning followed by a rinse. These are best appreciated moistened or lightly oiled.

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