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Ferrokinoshitalite : (Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2

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minID: D6C-4MT

Ferrokinoshitalite : (Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2

This image has been released to the public domain and may be used freely.
Largest Crystal Size: 1.5 cm

Ferrokinoshitalite and “chloroferrokinoshitalite” were recently (Jan 2019) added to the species list for the Franklin Mining District on the basis of detailed chemical analyses by Tracy (1991) for Ba-rich micas from Sterling Hill. (See the Sterling Mine publication list.) Van King has now interpreted these analyses in terms of current mica terminology and has found that one of them corresponds to ferrokinoshitalite and three to “chloroferrokinoshitalite”. The latter has never been published. Tracy and Dunn (1995) referred to these as “anomalous anandite”. See the Mindat description of “chloroferrokinoshitalite” for details.

More recently, EDS analysis of material found on the Buckwheat Dump in 1995 and/or 1996, and pictured here, has identified another occurrence of likely ferrokonoshitalite in the District. Like the Sterling Hill material, this is not end-member ferrokinoshitalite but probably has a hendricksite component. See the analysis “photo” further discussion. Note that while the material was found on the Buckwheat Dump, it is not typical of the material found there. In fact, it was found in a wooded/brushy area on one edge of the Dump. Several other unusual minerals were also found here. But many of these, including the ferrokinoshitalite, have substantial amounts of Zn, so there is little doubt that this is “Franklin” material.

The main crystal in the photos is about 1 cm tall and 1.5 cm in greatest diameter. The matrix is mostly a “fast-fizzy” gray to pink carbonate (presumably calcite), but some “slow-fizzy” grains and a bit of insoluble residue were observed. Included in some smaller, broken, crystals of ferrokinoshitalite are small, nearly colorless crystals of fairly euhedral “apatite”.


This photo has been shown 134 times
Photo added:3rd Jan 2019
Dimensions:4100x3328px (13.64 megapixels)
Software:Adobe Photoshop CS3 Windows

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