Proceeding down the alphabet (I did skip quite a few that were just not very photogenic) we come to a rare but beautiful mineral cuprian Austinite from Mina Ojuela. I like this mineral enough to also own 3 other specimens in the cabinet sizes. Rare and pretty is a mineral collector and a mineral dealer's grail.
You can read more about austinite at webmineral, Austinite Mineral Data. I particularly like webmineral's audio feature which gives the proper pronunciation of the mineral name. Of course the pronunciations are the accepted American version. There are regional differences in pronunciation and some minerals or mineral terms have more than one accepted pronunciation - like chalcedony and rutile.