A very rich and rare example of this rare phosphate species named after noted author and collector, John Sinkankas. I used to live down the street from him and he sold me a half dozen of these in the late 90s. Beyond that stash, I simply have not seen any good ones for sale since. This is extremely rare material, and hard to obtain today.
Attribution: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0
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