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Calcite (var: Lead-bearing Calcite) ("Plumbocalcite") (RARE locality specimen) (ex Kay Robertson Collection)
- Concepcion del Oro, Concepcion del Oro Municipality, Zacatecas, Mexico
- Small Cabinet, 5.3 x 3.7 x 3.7 cm
- Start Time: 07/09/2020 8:45:00 pm (CDT)
- End Time: 07/16/2020 6:45:00 pm (CDT)
- Auction Closed
- Winning Bid: $135
Item Description
This is certainly a first for us, as we've never seen a crystal of Lead-bearing Calcite from Concepcion del Oro before. You might have encountered a specimen of Calcite from Tsumeb that was labeled as containing lead, but I can't think of a single instance of something like this coming from Mexico before I saw this specimen. This large miniature / small cabinet is labeled as being "Plumbocalcite", which at one point in time might have been a valid species, but it is now defined as the varietal Lead-bearing Calcite. The specimen features a 4.2 cm, stout, fairly well-formed, sharp, partial rhomb of grey-white Lead-bearing Calcite surrounded by small, sparkling, golden, metallic crystals of Pyrite and no matrix. It presents well as you can see from the photos. I have to believe that this Calcite crystal was analyzed at some point for lead content (which according to mindat can run as high as 4.6% in crystals from Poland), as it is something that one cannot identify visually. A really cool esoteric specimen that could make a great addition to any Calcite collection or a suite of minerals from Mexico. Ex Kay Robertson Collection (#2619). Kay was a prominent California collector, who specialized in European classics. She nearly lived 100 years from April 1920 - March 2020. See the article in the March-April, 2007 Mineralogical Record ( https://www.mineralogicalrecord.com/pdfs/Kay%20Robertson%20Collection.pdf ), and the 50+ page article in the German Magazine "Mineralien Welt" November-December 2017.
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Bidding History
Bid Amount | Bid Time |
---|---|
$135 | 07/16/2020 5:59:55 pm (CDT) |
$125 | 07/16/2020 5:56:27 pm (CDT) |
$116 | 07/16/2020 5:56:27 pm (CDT) |
$85 | 07/15/2020 4:12:21 am (CDT) |
$75 | 07/15/2020 4:12:21 am (CDT) |
$65 | 07/15/2020 4:06:12 am (CDT) |
$55 | 07/15/2020 4:05:42 am (CDT) |
$50 | 07/15/2020 4:05:41 am (CDT) |
$45 | 07/15/2020 2:34:33 am (CDT) |
$40 | 07/15/2020 2:34:33 am (CDT) |
$10 | 07/12/2020 4:50:12 pm (CDT) |