Two Generation Chocolate CALCITE W FLUORITE - - Santa Eulalia, Mexico - - Ex Bob Jones
Item History & Price
| Reference Number: Avaluer:4749757 |
I'm pleased to offer this attractive specimen of Calcite with Fluorite from the Santa Eulalia district, Chihuahua, Mexico. The specimen measures 2.99 x 1.39 x 1.36 inches or 7.60 x 3.53 x 3.46cm and is in very good condition. This is from the Ron Blackstone (1947-2016) collection of Phoenix, Arizona and comes with a label from the Bob and Evan Jones collection. Also included, but not shown, is an original Bob Jones very small label with the notation on the backside "5/63 $3.00 V...ic Hoffman (sic)." Bob transferred most of his specimens to his son Evan over the years and Evan specialized in Mexican specimens for many years before turning his focus to Arizona specimens.
Victor Hoffmann was a graduate student at the University of Arizona in May, 1963 and operated, for a short time, a mineral dealership with fellow student, John S. White under the name of Delmann Minerals. They had a booth together at the 1962 Tucson Show (mineralogicalrecord.com). White would later become curator at the Smithsonian and was the founder of the excellent mineral magazine The Mineralogical Record. Hoffmann became a geologist and did his Ph.D dissertion (UA) on the mineralogy of the Mapimi district, Durango, Mexico.
I'm quite certain that this is from the Potosi mine within the Santa Eulalia district---the mine is very well-known for its chocolate calcite specimens of this habit. This piece shows larger dogtooth calcite crystals with a preferential crystallization of much smaller dogtooth calcite crystals. These are flanked by unusually large (to my experience) colorless fluorite crystals. I've viewed thousands of these specimens over the years in the warehouses of Top Gem Minerals of Tucson, AZ and have found these occasionally to sport very small (less than 5mm) fluorite crystals on the calcite crystals---I have seen nothing even remotely approaching the size of the fluorite crystals present on this particular piece.
Cool piece and an interesting label trail!
Please check my feedback and my other items. All specimens are carefully wrapped, come with complete and accurate labels and are quickly shipped. As always, your complete satisfaction is unconditionally guaranteed and I even offer FREE return shipping on any item that fails to satisfy for any reason---you can't go wrong. I'm reminded of the firm pledge printed on the old Foote Mineral Company mineral catalogs from more than a century ago,
"Quality of specimens is assured as we permit return of specimens at our expense."
Thanks for looking!
Victor Hoffmann was a graduate student at the University of Arizona in May, 1963 and operated, for a short time, a mineral dealership with fellow student, John S. White under the name of Delmann Minerals. They had a booth together at the 1962 Tucson Show (mineralogicalrecord.com). White would later become curator at the Smithsonian and was the founder of the excellent mineral magazine The Mineralogical Record. Hoffmann became a geologist and did his Ph.D dissertion (UA) on the mineralogy of the Mapimi district, Durango, Mexico.
I'm quite certain that this is from the Potosi mine within the Santa Eulalia district---the mine is very well-known for its chocolate calcite specimens of this habit. This piece shows larger dogtooth calcite crystals with a preferential crystallization of much smaller dogtooth calcite crystals. These are flanked by unusually large (to my experience) colorless fluorite crystals. I've viewed thousands of these specimens over the years in the warehouses of Top Gem Minerals of Tucson, AZ and have found these occasionally to sport very small (less than 5mm) fluorite crystals on the calcite crystals---I have seen nothing even remotely approaching the size of the fluorite crystals present on this particular piece.
Cool piece and an interesting label trail!
Please check my feedback and my other items. All specimens are carefully wrapped, come with complete and accurate labels and are quickly shipped. As always, your complete satisfaction is unconditionally guaranteed and I even offer FREE return shipping on any item that fails to satisfy for any reason---you can't go wrong. I'm reminded of the firm pledge printed on the old Foote Mineral Company mineral catalogs from more than a century ago,
"Quality of specimens is assured as we permit return of specimens at our expense."
Thanks for looking!
