Probably dates back to the 1960s or earlier. On the back, small white crystals of metavauxite are also present. Ex Jack Halpern Collection: this piece is shown on page 111 of Addicted to Beauty: The Legacy of Jack Halpern (Mineralogical Record, March 2025).
Photos by László Kupi
| Date | Collector | Acquisition price |
|---|---|---|
| — | The Arkenstone | Not disclosed |

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