http://rruff.info/doclib/MinMag/Volume_21/21-115-156.pdf

Through FilePursuit you are able to link to other websites which are not under the control of FilePursuit. We have no control over the nature, content and availability of those sites. The inclusion of any links does not necessarily imply a recommendation or endorse the views expressed within them. Connecting to our site means that you accept this policy agreement.