Quartz

Unknown Owner

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This large example of Japan-law twinning in quartz was purchased by Dr. Ed David, former science advisor to President Nixon and a chair of the White House Science Office, in 1993. It is an outstanding example of good size. The specimen is very lustrous, very bright, and has an unusually good thickness to it. Most twins of this habit are skinny, but this is fat: 4.5 cm across at the twin plane in the middle. It is nearly pristine. Weighs 925 grams. Twins of this habit, in this size, are uncommon.