Sanidine (GEM quality) (ex Irv Brown Collection)

Itrongay, Mahasoa East Commune, Betroka District, Anosy Region, Tulear Province, Madagascar
1.6 x 1.3 x 0.8 cm
Start Time: 11/01/2018 7:00:00 pm (CDT)
End Time: 11/13/2018 6:30:00 pm (CST)
Auction Closed
Winning Bid: $35

Item Description

For a long time the crystals from this locality were labeled as being Orthoclase, but I think every piece that's been tested has proven that they're all Sanidine. With that said, they are some of the most iconic crystals of Feldspar in the world as they are GEM quality (a great rarity for Feldspar) and beautifully colored. Itrongay has been known for around 100 years producing these specimens. The yellow color of the crystals is actually caused by iron content, which can replace aluminum in the space cell of the Sanidine molecules. This piece is a classic specimen of this beloved material dating back to the 1960s featuring fine blocky monoclinic form, sharp lustrous faces and WATER CLEAR clarity with that fine yellow color. This is a good overall representation of the material, but please note it is cleave on one side, and contacted in a few spots, so it's not damage free. From the worldwide thumbnail / miniature collection of Irv Brown.

Bidding History

Bidder Bid Amount Bid Time
forrestcarithers $35 11/13/2018 4:40:46 pm (CST)
tillyfoster $26 11/09/2018 4:48:36 pm (CST)
olivier1268 $25 11/08/2018 2:52:44 pm (CST)
tillyfoster $10 11/04/2018 4:17:37 am (CST)