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17th Nov 2018 15:47 UTCPavel Kartashov Manager
What is locality of your sample? Outokumpu?
17th Nov 2018 15:51 UTCMark Casto
17th Nov 2018 19:01 UTCFrank K. Mazdab 🌟 Manager
The problem here is that the analyst gave you a printout that appears to say, "this is the match", instead of giving you a printout saying, "these are the possible matches". So minerals that might be more likely and geologically reasonable, but whose measured peaks are perhaps slightly offset from the database spectrum, get incorrectly eliminated from consideration.
I'd like to see an overlap of the hematite XRD pattern here to see how defensible karelianite really is.
edit: let me add that the "syn" at the end means that the database pattern that came up in this match was measured on someone's lab-created material, and that researcher had the pattern added to the XRD database. Karelianite a natural mineral, but this particular material, with added 0.6 apfu Ti, is not. I bet the actual pattern for natural karelianite, which is not typically Ti-enriched, would not be such a great match for your errant peaks (at least no better or worse than hematite).
17th Nov 2018 19:20 UTCFrank Keutsch Expert
Frank is correct: The lines identified as karelianite also are a really good match for hematite. I will not comment in detail but I have previously encountered some similar problems. False analysis in a way is worse than none as then one can be convinced of the wrong thing...
So very, very likely this is hematite with goethite...
Frank
17th Nov 2018 20:25 UTCReiner Mielke Expert
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