Dear Experts..
I thought it was muscovite (attached image..Xrd Pattern, this is bulk sample!!).
And its chemical composition is SiO2 about 40%, Al2O3 about 40%, K2O about 10% and CaO 6%.
But,, In the XRD Peaks, the almost peaks intensity fits well, but the highest peak(about 2theta 26.853) intensity isn't strong enough. So I think it might be some other minerals.
In my XRD database, it doesn't match other materials except the muscovite.
Because it is a smooth-surface bead(like gems), it is difficult to see the layers(like mica or usual muscovite).
Its color is grayish green. (The beads of similar data are green and ivory.)
Although the analysis data is lacking, is this muscovite or some other minerals?
If so, what is it..and What additional analysis should be done(non-destructive analysis)?
Please give me your opinions. Thank you very much!!
Dear Lee Su Jin ,
your peak height might suffer from preferred orientation.
You sholud mill*) your sample or at least use a spinning sample stage.
By the way; your black peaks at about 26° and 46° have a peak height ratio of about 3:1. This is in accordance with muscovite pattern.
See for example Fig. 1 of:
Article Removal Process of Structural Oxygen from Tetrahedrons in Mu...
Or:
https://rruff.info/Muscovite/R040104
Scroll down to the XRD pattern...
Thus, there is no significant preferred orientation with respect to these two peaks of the muscovite phase in your sample and that phase isn't a tiny one. But due to unknown reason(s) your XRD evaluation software did not find the muscovite...
*) sorry; milling is by far not a nondistructive procedure, as you demanded for...
Best regards
G.M.
It seems to me that the agreement of your peaks with the bars is very good, so it is muscovite, with preferred orientations effects. As Gerhard Martens suggested you can mill your sample to reduce the grains, otherwise the preferred orientation is not a problem if you should perform, for example, a structural refinement, because there are specific coefficients that can simulate this effect
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