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Santafeite

Posted by Rock Currier  
avatar Santafeite
December 29, 2008 02:30AM
Click here to view Best Minerals S and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.


Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities? We have no images of this mineral nor are there any on Mindat.


Santafeite
Na3Mn22+Mn24+(VO4)4(OH)3-2H2O orthorhombic
The Handbook of Mineralogy says the mineral is black with acicular crystals to 4mm 9 probably from the New Mexico, but the picture of Santafeite shown here from Arizona apparently shows yellow blebs of Santafeite.(Check this out with Tony Kampf) Other sources site the color as brown.


Santafeite
USA
Arizona, Navajo Co., Navajo Indian Reservation, Monument Valley, Mystery Valley, Monument No. 1 channel, Monument No. 1 Mine
Santafeite FOV 6mm© 2005 M. Kampf


The Santafeite from this locality occurs in sandstone and is associated with carnotite.1
1. Handbook of Mineralogy, Anthony, Bideaux, Bladh & Nichols, Vol IV, p.519

We need someone to tell us about the Santafeite specimens from this loclaity.


Santafeite
USA
New Mexico, McKinley County, Grants Uranium District.
Found in a cliff-face outcrop of the Todilto limestone in an unnamed uranium mine in section 25, T13N, R10W, about 19 km north of Grants, New Mexico, and 1.6 km north of the McKinley-Valencia county line. “Santafeite occurs as well-defined rosettes of radially oriented acicular crystals…Individual rosettes range from about 1.5 to 4 mm. In diameter. Some of them are triangular in profile along the diameter, suggesting an original spherulitic form from which the upper two-thirds has been broken away. A typical rosette 2.8 mm. In diameter consists of crystals measuring approximately 0.3 mm along the a-axis, 0.07 mm along the b-axis and 1.4 mm along the c-axis. The small size and fragile character of individual crystals prohibited optical goniometric measurements. Of the forms present, however, the b-face is especially prominent. Cleavages are (010) easy and perfect, and (110) distinct; very brittle; color black…The material is translucent only in very small fragments, which shows pronounced pleochroism ranging from dark reddish brown to yellowish brown…Insufficient material was present in the original sample to permit a complete chemical analysis, so the locality was revisited by the writers in the summer of 1054. It was found that the outcrop from which the original sample was taken had been destroyed by subsequent mining operations, and none of the santafeite left exposed in 1951 remained. A second search of most of the cliff edge and surface mine workings in the Todilto limestone between San Mateo road and Haystack Mountain in 1955 was also fruitless. Fortunately, however, an additional 100 milligram sample of santafeite was collected in the summer of 1956 by Mr. Robert Thaden and Dr. Alice D. Weeks of the U.S. Geological Survey, from a shallow open pit along the rim outcrop of the Todilto limestone in Section 26, which adjoins the location of the original sample.”1
It occurs as a crust of small brown rosettes of acicular crystals sometimes in association with cuprosklodowskite. …Santafeite is named for the Atchison, Topeka and Santa Fe Railroad Company, because of its contribution to exploration and development of the New Mexico uranium deposits.”2 “Found on jointed surfaces in limestone. The entire find covered about a square foot of fracture surfaces and consisted of less than a flat of specimens. The best specimen is a limestone fragment about 4x4 inches with less than half of the specimen covered with a scattering of radiating black rosettes of santafeite. There were some individual crystals on the specimen up to about 5 mm long and 2mm wide. The type specimen and the best specimen is in the Mineralogical Museum of the New Mexico Bureau of Geology and Mineral Resources of the Mew Mexico Institute of Mining and Technology.3
1 American Mineralogist, Vol. 43, 1958 p. 677-80. 2 Mineralogical Record, Vol. 20, 1989, p 10.- 3 Robert Weber, personal communication 2002.
Dr. Virgil Lueth Mineralogist/economic Geologist, Curator of the Mineralogical Museum, New Mexico Bureau of Geology & Mineral Resources, New Mexico Institute of Mining and Technology referred me to Robert H. Weber of Socorro, NM 87801-4366, who aparently collected the material.
[Rock Currier, 28 December 2008]



Click here to view Best Minerals S and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.

Rock Currier
Crystals not pistols.



Edited 9 time(s). Last edit at 07/26/2010 11:34AM by Rock Currier.
Re: Santafeite
December 29, 2008 09:31PM
    
There is a santafeite jpg posted on webmineral. It's Jeff's.
avatar Re: Santafeite
December 31, 2008 08:30AM
Jim,
Thanks for the reference. I have posted the URL in the article and I guess it will be good till someone removes it or changes it. I should have checked google images to see if one was out there. Thanks for helping make the articles better.

Rock Currier
Crystals not pistols.
Re: Santafeite
October 04, 2010 07:31AM
Dear Mr. Currier,

I inform to you that I am interested in a sample of Santafeite.
It is possible?
I can offer you a large list of Micromount minerals of all the world.
I am interested also in other american minerals.
I beg you to send me your list to sdelmagro@cheapnet.it. Thanks.
I wait your news.

Best regards.

Stefano
avatar Re: Santafeite
October 05, 2010 03:41AM
Dear Stefano,
Sadly, I do not have any Santafeite to trade. I hope your search may prove better elsewhere.

Rock Currier
Crystals not pistols.
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