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Improving Mindat.orgQuestionable bayldonite

22nd Mar 2006 18:41 UTCUwe Kolitsch Manager

http://www.mindat.org/picshow.php?id=13110

I have never seen such bayldonite, but I might be wrong considering it doubtful. Can anyone confirm the occurrence of such a prismatic habit?

22nd Mar 2006 19:22 UTCMarco E. Ciriotti Manager

I think that it's not bayldonite; I have never seen the prismatic habit.

22nd Mar 2006 19:27 UTCDavid Von Bargen Manager

Gebhard "Tsumeb" p. 162 (2nd oxidation zone) "They are black-green, brilliant, prismatic, often doubly terminated crystals up to 1cm withv stepped faces."

22nd Mar 2006 19:28 UTCSteve Rust Manager

Probably olivenite or Cu-adamite, or Zn-olivenite may be.

23rd Mar 2006 00:16 UTCBrent Thorne Expert

The specimen of bayldonite was purchased from Clive Queit and was labelled bayldonite. Georg Gebhard has seen the specimen and agreed that the label was correct. I have not had the specimen analyzed as to the validity of the description. If there is a question as to the validity, then I will remove it from the mindat files.

Brent Thorne

23rd Mar 2006 05:22 UTCBrent Thorne Expert

For those of you that have not seen prismatic crystals of bayldonite. Here is a specimen from the John Schneider collection that has been SEM EDAX and XRD verified. http://www.tsumebfineminerals.com/schneider/1061d.jpg

23rd Mar 2006 07:25 UTCMarco E. Ciriotti Manager

Well! Ever some think to see.

Thanks.

23rd Mar 2006 08:23 UTCUwe Kolitsch Manager

Thanks Brent! Learnt something today.
 
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