Mineral: Quartz (Japan Law twin)
Locality: Wegner Quartz Crystal Mines, Mount Ida, Montgomery County, Arkansas, USA
Dimensions: specimen is 6.5 cm, Largest quartz crystals are 2.5 cm
Description: Shale or clay inclusions in quartz. So called blue phantom quartz. The 2 largest crystals are an example of Japan Law twinning.
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