<a href="https://en.wikipedia.org/wiki/Petedunnite" class="extiw" title="en:Petedunnite">Petedunnite</a>, Apatite group
<dl><dd><dl><dd>Locality: Franklin Mine, Franklin, Franklin mining district, Sussex County, New Jersey, USA</dd>
<dd>Dimensions: 2.5 cm x 3.5 cm x 2 cm</dd>
<dd>This specimen was found (in the late 1970s) on the lower part of the Trotter Dump – i.e. next to the Buckwheat Pit and just across Evans St. from the Buckwheat Dump, which is the TL for petedunnite. It doesn’t seem unreasonable that, ultimately, this specimen is from the same material. In any case, a recent EDS scan is virtually identical to that for a specimen of petedunnite that was gifted to me by John Cianciulli (then curator of the Franklin Museum). See <a href="//commons.wikimedia.org/wiki/File:Petedunnite.jpg" title="File:Petedunnite.jpg">File:Petedunnite.jpg</a>. I have posted an overlay of the scan for this specimen on the scan for the specimen that I got from John. The scans are virtually identical. See the "analysis" child photo. The scan result was a complete surprise. For all these years, I had kept the specimen not for the green pyroxene (of which there are only a few unbroken crystals), bur rather for the unidentified, red-brown, sort of flattened hexagonal, crystal show on the left. The scan result for this was also a complete surprise. Apparently it is an arsenian member of the apatite group (such as perhaps johnbaumite) with some REE component (such as perhaps britholite). See the scan for further comments. I have posted it as “apatite group” even though that seems like much too generic a term to use in this case.</dd></dl></dd></dl>
<a rel="nofollow" class="external text" href="https://www.mindat.org/user-11235.html">Modris Baum</a>
2018-12-12
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