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It is impossible to guarantee the chemical composition of a mineral specimen without X-ray diffraction or fully-quantitative EDS analyses, which are very time consuming and costly. It is our goal to provide affordable minerals; the cost of analyses to confirm questionable ID's would add considerably to the price of a specimen.
However, you can buy with confidence from this site, because (1) any time there is a doubt as to identity, this will be indicated clearly in the description of the specimen, and (2) all rare species offered as such are "what the label says, or your money back" (according to our return policy; please see order info for details).
The degree of certainty of a mineral's I.D. must be evaluated on a case-by-case basis (depending on origin of the specimen, among other factors) - and this will be indicated when appropriate for a mineral specimen.
When there is considerable doubt, a mineral will be sold as UNIDENTIFIED. This practice may not appeal to some, but consider the prices involved. A $4.00 specimen would no longer be $4.00 if it had to be put through XRD / EDS analysis.
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