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PhotosPhosphovanadylite-Ca - South Rasmussen Ridge Phosphate Mine, Soda Springs, Caribou Co., Idaho, USA

27th Jan 2014 15:56 UTCStephan Wolfsried Expert

I just notified that Phosphovanadylit-Ca occurs in Cubes. So what I got there must be something else. Some ideas?

And can one of the admins change the species to Unidentified please?

Thank You Stephan

27th Jan 2014 16:40 UTCDavid Von Bargen Manager

You can actually change it to unidentified yourself. Edit the photo to "Other category" - unidentified is second to last in the dropdown list of photo types.

27th Jan 2014 19:24 UTCStephan Wolfsried Expert

Done.

Stephan

28th Jan 2014 01:11 UTCSteve Stuart Expert

Hello, Stephan!

The description in Mindat of sincosite from the same locality looks very similar to your photograph: "Crystals thin tabular, square to rectangular, with {001}, {010}, and {110}; striated on {001} parallel <100> and <110>; may be composite with many superposed plates in nearly parallel position. Forms rosettes, crudely radial and in scaly aggregates; botryoidal to nodular massive."

Regards,

Steve Stuart

28th Jan 2014 10:02 UTCStephan Wolfsried Expert

Steve,

there is a photo from Tom Loomis with both, Phosphovanadylite-Ca and Sincosite on mindat:

http://www.mindat.org/photo-474480.html

If this Sincosite is valid i believe my crystals cannot be the same species. I have Sincosite from different Localities in my collection, it is always with a similar habit Tom showed us. Sincosite crystals always have a rectangular inner crack structure like Torbernite or Autunite as well.

The dark green rosettes do not have them at all, and the luster is extremely high, which I do not know from Sincosite as well.

So after all I am pretty sure this isn't Sincosite either. Thank You for posting Your opinion.

Stephan

28th Jan 2014 19:03 UTCUwe Kolitsch Manager

I agree - sincosite-group minerals can be ruled out.

27th Mar 2014 00:45 UTCThomas Loomis 🌟 Expert

Hi Guys

Just noticed your post on the black rosettes in Stephan's photo. Nice photo! You found one of the unknowns that so far cannot be described since the crystal structure is too complex for single xl XRD work. I attached an SEM photo. Tony Kampf has done all the work for me on the Rasmussen. These definitely are not sincosite. The chemistry is close and the EDS has shown it to be a be something like Ca2FeV10O28 according to Tony. If you ever figure it out, please let me know. Very few of these exists. In the SEM image there is some selenium, sincosite and some phosphovanadylite-Ca. In Stephan's photo the small creamy xls are most likely phosphovanadylite. Stephan, may I use this photo in a paper I'm writing up on this locality?

Tom

28th Mar 2014 19:56 UTCStephan Wolfsried Expert

Tom,

for sure. Feel free to make use of it.

Cheers Stephan

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