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Ferri-winchite from
South Tirodi Mine, Tirodi, Balaghat District, Jabalpur Division, Madhya Pradesh, India


Locality type:Mine
Classification
Species:Ferri-winchite
Formula:◻(NaCa)(Mg4Fe3+)Si8O22(OH)2
Comments:Microprobe analyses published on Rruff.info as winchite corrosponds to the following composition (typical): (Na0.094K0.06)0.154 (Ca1.354Na0.646)2 (Mg4.123Fe20.335Mn20.227Fe20.181Al0.108Ti0.002)4.976 Si8.025O22((OH)1.828F0.167O0.004)1.999

It should be noted that the total oxide wt% is low <98%.

As Fe >Al, the composition corresponds to ferri-winchite rather than winchite. The formula is normalized using Andrew J. Locock (2014): An Excel spreadsheet to classify chemical analyses of amphiboles following the IMA 2012 recommendations. Computers & Geosciences, Volume 62, pp 1-11.The formula corresponds well with the published formula on Rruff.info
Colour:Matted group of tan colored bladed crystals
Confirmation
Validity:Confirmed
Confirmation Methods:XRD
EPMA
Data
Mineral Data:Click here to view Ferri-winchite data
Locality Data:Click here to view South Tirodi Mine, Tirodi, Balaghat District, Jabalpur Division, Madhya Pradesh, India
Data Identifiers
Mindat Occurrence Record ID:914387
Long-form Identifier:1:3:914387:6
GUID (UUID V4):0
References
RRUFF Specimen: R060704
 
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