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Fluorapatite : Ca5(PO4)3F, Rhodonite : CaMn3Mn[Si5O15], Franklinite : Zn2+Fe3+2O4

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minID: G54-Q4N

Fluorapatite : Ca5(PO4)3F, Rhodonite : CaMn3Mn[Si5O15], Franklinite : Zn2+Fe3+2O4

This image is copyrighted. Unauthorized reproduction prohibited.
Field of View: 25 mm
Weight: 50.63 g

Fluorapatite

Mass: 50.63

Small area of blue-green Fluorapatite on upper right, pink Rhodonite, black Franklinite.

Mineral identification correction from Chester Lemanski, Peter Chin and Paul Brandes - thank you.


This photo has been shown 187 times
Photo added:16th Jun 2018
Dimensions:3481x2616px (9.11 megapixels)
Camera:CANON EOS Rebel T6

Data Identifiers

Mindat Photo ID:895546 📋 (quote this with any query about this photo)
Long-form Identifier:mindat:1:4:895546:0 📋
GUID:20f9428f-6642-4389-86ae-0e44e30496cd 📋
Specimen MinIDG54-Q4N (note: this is not unique to this photo, it is unique to the specimen)

Discuss this Photo

PhotosCyprine - Buckwheat dump mineral collecting site, Franklin Mine, Franklin, Franklin mining district, Sussex Co., New Jersey, USA

17th Jun 2018 00:45 UTCPeter Chin Expert

The blue-green mineral looks more like apatite than cyprine. Moreover, apatite is a well known association with rhodonite rather than cyprine for Franklin.

17th Jun 2018 02:02 UTCPaul Brandes 🌟 Manager

More than likely, it's fluorapatite as opposed to true apatite which is not listed from the Buckwheat either.

17th Jun 2018 05:19 UTCPeter Chin Expert

You are correct, most likely fluorapatite, though there is a possibility of it being an arsenic bearing member of the apatite group like johnbaumite.

17th Jun 2018 15:09 UTCUwe Kolitsch Manager

Message sent.

17th Jun 2018 19:10 UTCDoug Gardner

I will add that the mineral does not fluoresce and I have two more similar pieces so I do not think it is anything rare like johnbaumite.


Now that fluorapatite has been pointed out a possibility, based on physical properties, I don't think I can distinguish between fluorapatite and cyprine. I submitted a delete request for the image. When I have a chance I'll submit to EDS analysis.


Doug Gardner

18th Jun 2018 12:40 UTCReiner Mielke Expert

A phosphate spot test with ammonium molybdate will distinguish them.

18th Jun 2018 22:37 UTCJeff Weissman Expert

I have a similar specimen - its most likely fluorapatite

19th Jun 2018 03:15 UTCSteven Kuitems Expert

That may be from a large boulder of that material I broke up, took only a piece or two and left a pile of it.

Probably fluorapatiite with rhodonite and abundant gahnite (very dark colored) It appeared somewhat layered in gross appearance no euhedral crystals just subhedral ones.

19th Jun 2018 05:22 UTCMark Heintzelman 🌟 Expert

07031030016017178915501.jpg
I also have somewhat similar material from the Buckwheat dump, ( a tray of odds and ends not formally added to the F/SH collection). Consists of very dark green gahnite with pink rhodonite and red fluorescing calcite, and yes, the blue is non-fluorescing fluorapatite.


19th Jun 2018 13:16 UTCDoug Gardner

Mark,


The blue-green material in your image looks very much like my sample. Where in your image do you see Gahnite? It looks like Franklinite to my untrained eye.


Doug

19th Jun 2018 15:20 UTCMark Heintzelman 🌟 Expert

08819910016017178919362.jpg
Doug, it's easier to note the fine distinction between black franklinite and greenish black gahnite in person, than it is from a photo image like this. There is no franklinite present on my samples (none that I can discern anyway), it appears to be all gahnite.


The association is more telling than the color between Fluorapatite or cyprine. Fluorapatite is commonly associated with rhodonite/bustamite, cyprine with golden andradite.




MRH

20th Jun 2018 03:25 UTCSteven Kuitems Expert

Doug, do you have a low powered microscope?

Under 10-20 power with proper lighting you can make out the typical dark green of the gahnite some will have typical octahedral shape but many are rounded grains tightly packed together. By the way most of the true vesuvianite I have found on the Buckwheat has been brown or reddish brown.


Steven
 
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