SPECIAL AUCTION: OLD CLASSIC MINERALS
from the Kay Robertson Mineral Collection
ends Tuesday June 25th, 2019

NOTE SPECIAL END DAY: TUESDAY June 25, 2019
at 6:30 PM (Central Time Zone)!


The Kay Robertson collection has thus far afforded a great deal of intellectual and mineral pleasure to us here at The Arkenstone, as well as collectors around the globe. Many specimens are of historical and mineralogical interest, so working with them has been a truly gratifying experience.We thought it would be a fun change of pace to produce a totally dedicated "Kay Auction," and let things go where they may.
Please note that a number of these specimens were purchased by Kay 50-60 years ago, at prices that ranged from several dollars to several hundreds of dollars at the time. If these were the prices a half-century ago, just imagine what the possible values are now. There might be some real bargains to be had! Text and photos by collector, Jeff Starr.

For those unfamiliar with the Kay Robertson Collection,

Kay is a prominent California collector who specialized in European classics
(see our blog at www. https://www.irocks.com/kay-robertson-a-treasure-in-the-mineral-collecting-world ;
and the 50+ page article in the German Magazine "Mineralien Welt" November-December 2017).

Happy hunting!
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Galena on Quartz, with Cotunnite, Anglesite, and Phosgenite
Christian-Levin Mine, Essen, North Rhine-Westphalia, Germany
6.9 x 5.4 x 3.7 cm
Albite on Quartz
Piz Beverin, Mathon, Hinterrhein Valley, Grischun, Switzerland
8.1 x 6.2 x 3.9 cm
Pyromorphite
Jeanette Mine, Kransberg, Usingen, Taunus, Hesse, Germany
6.1 x 4.4 x 3.2 cm
Apatite on Feldspar
Conselheiro Pena pegmatite district, Minas Gerais, Brazil
9.2 x 6.4 x 4.0 cm
Tetrahedrite with Chalcopyrite
Tsumeb Mine, Tsumeb, Namibia
8.1 x 6.5 x 4.0 cm
Siderite with sagenitic Rutile ps. Ilmenite
Cavradi gorge, Curnera Valley, Tujetsch, Grischun, Switzerland
5.6 x 4.3 x 2.8 cm
Malachite on Limonite (Germany!)
Vahlberger Zug Mine, Olpe, Siegerland, North Rhine-Westphalia, Germany
5.0 x 3.7 x 2.9 cm
Calcite included by Copper (old classic)
Quincy Mine, Houghton County, Michigan, USA
3.6 x 2.9 x 2.6 cm
Tetrahedrite on Dolomite, Chalcopyrite, and Siderite
Clausthal-Zellerfeld, Harz, Lower Saxony, Germany
5.7 x 4.1 x 2.4 cm
Calcite (heart twin)
North Vernon, Jennings Co., Indiana, USA
1.9 x 1.6 x 1.1 cm
Calaverite
Ajax Mine, Cripple Creek District, Teller Co., Colorado, USA
5.2 x 3.2 x 2.8 cm
Azurite on Fluorite (fluorescent)
Clara Mine, Rankach valley, Oberwolfach, Baden-Wurttemberg, Germany
10.7 x 6.9 x 5.0 cm
Baryte and Chalcopyrite
Dreislar Mine, Winterberg, Sauerland, North Rhine-Westphalia, Germany
6.3 x 5.8 x 3.9 cm
Rosasite
Ojuela Mine, Mapimi, Durango, Mexico
6.2 x 4.1 x 3.7 cm
Cerussite (fl) and Malachite
Broken Hill, New South Wales, Australia
5.5 x 4.4 x 4.0 cm
Baryte
Clara Mine, Rankach valley, Oberwolfach, Baden-Wurttemberg, Germany
6.2 x 4.3 x 1.8 cm
Vanadinite on Calcite (unusually sparkling , USA locale!)
Old Yuma Mine, Saguaro National Monument, Tucson Mts, Pima Co., Arizona, USA
6.1 x 4.8 x 4.0 cm
Calcite (fluorescent)
Grant County, New Mexico, USA
6.1 x 2.6 x 2.5 cm
Thaumasite - important large crystal!
Sulitjelma Cu Mines, Sulitjelma, Fauske, Nordland, Norway
6.9 x 2.8 x 1.1 cm
Rutherfordine, Schoepite, Cuprosklodowskite and Digenite
Musonoi Mine, Kolwezi, Kolwezi mining district, Lualaba, DR Congo
4.7 x 3.7 x 2.2 cm
Anglesite
Tsumeb Mine, Tsumeb, Namibia
4.3 x 2.5 x 1.2 cm
Garnet with Calcite (fl) and Smoky Quartz
Saarbrucken, Saarland, Germany
7.3 x 5.7 x 4.1 cm
Calcite (fluorescent)
Charcas, San Luis Potosi, Mexico
8.7 x 5.1 x 4.3 cm
Achtaragdite ps. Helvite
Akhtaragda River mouth, Vilyui River Basin, Sakha Republic, Russia
6.5 x 6.5 x 3.5 cm
Native Copper (rare locale!)
Spania Dolina (Herrengrund), Banska Bystrica Co., Slovakia
7.2 x 4.2 x 3.8 cm
Chrysocolla ps Hemimorphite, and Cerussite
79 Mine, Banner Dist., Dripping Spring Mts, Gila Co., Arizona, USA
5.6 x 3.8 x 2.7 cm
Calcite on Cuprian Austinite
Guchab prospect, Grootfontein, Otjozondjupa Region, Namibia
5.6 x 2.7 x 1.9 cm