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What mineral has this analysis result?

Posted by Raphael Odutola  
Raphael Odutola September 14, 2018 11:11PM
Could you kindly tell me the name of mineral with this analysis?
LOSS(900°c) 0.46% , Al2o3 25.67% , Sio2 65.38% , Fe2o3 0.27% , Cao 0.07% Mgo 0.03% , K2o 0.09% , Na2o 0.55%, Tio2 0.01% , Li2o 7.13%
Łukasz Kruszewski September 14, 2018 11:54PM
Hi. I've recasted this analysis and it calculates well into spodumene, with the empirical formula being (Li0.91Na0.03)(Al0.96Fe0.01)Si2.08O6.09.
Doug Daniels September 15, 2018 12:45AM
Sure looks close to spodumene's ideal formula - 8.0% Li2O, 27.4% Al2O3, 64.6% SiO2. If you have a specimen, what does/did it look like, and where was it found?

Edited 1 time(s). Last edit at 09/15/2018 12:46AM by Doug Daniels.
Raphael Odutola September 15, 2018 03:17PM
Please find attached the picture. It was found in Nigeria.

Doug Daniels September 16, 2018 03:29AM
Not helpful.... what did the SPECIFIC specimen analyzed look like? A pile of rocks is useless for us to help. And, can you give a more specific location in Nigeria?

Edited 1 time(s). Last edit at 09/16/2018 03:31AM by Doug Daniels.
Raphael Odutola September 16, 2018 10:28PM
It was found in Kaduna State and Nassarawa State Nigeria.

Doug Daniels September 17, 2018 02:37AM
From the latest 3 photos - the first and third do suggest spodumene; the second one is a bit iffy. Something like XRD would be more definitive, but may not be accessible or affordable to you. More importantly, how important is it to know the identity? Are you looking to mine/sell the mineral? Just curious? Ideas such as these.
Ben Grguric September 17, 2018 05:21AM
Second one could be petalite. Apparently when gently heated petalite often gives off a bluish phosphorescent light. Never tried it myself but simple enough experiment.
Wayne Corwin September 17, 2018 02:39PM
How much "gently heated"?
Ben Grguric September 17, 2018 10:51PM
Don't know, never tried it. Dana mentions this property.
Doug Daniels September 19, 2018 12:28AM
Ben - I too thought petalite as a possibility, but didn't bother to calculate the percentages. Plus, so far as I know it usually doesn't form big masses as shown (but I could well be wrong). As far as "gently heated" - maybe place a piece on a hot plate, and slowly raise the temperature (assuming Raphael has access to one)? Or use a butane/propane torch, again being very slow at heating the specimen.

I also noticed that Pough reports spodumene as being thermoluminescent, but no color was given (at least in my version). Also, my version of Dana's Manual has no entry for petalite, but doesn't mean the property doesn't exist. Too many references to check.

Edited 1 time(s). Last edit at 09/19/2018 12:36AM by Doug Daniels.
Wayne Corwin September 19, 2018 12:37AM
Petalite can come much bigger than that, I've seen bigger in New Hampshire, USA.
Doug Daniels September 19, 2018 12:39AM
As I said, I could be wrong......
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