Mimetite (Type Locality, dated 1806 ex. Royal Cabinet)
Small Cabinet, 6.2 x 4.2 x 3.5 cm
Johanngeorgenstadt, Erzgebirge, Saxony, Germany (TL)
Ex. Kay Robertson; Vienna Natural History Museum

Mimetites from the Type Locality in the Erzgebirge, Saxony, Germany are one of those old classics that you almost never see for sale and most people will never even hold in their lives as a collector. Really, they only come out of old museums, and such is the history for many of Kay Robertson's pieces. This well-terminated, tabular crystal has very good luster and a rich, yellow-orange color. The stunning, centered, sharp crystal is 11mm across. The major find here dates to the early 1800s, and shockingly really is the TYPE LOCALITY for Mimetite - a common species today from only a few other locales, but generally rare in Europe at the time. This is an aesthetic, classic specimen with a great 1806 label from the Vienna Natural History Museum (at the time, the "Royal Imperial Mineral Cabinet"). It is fitting that this was piece #10,000 in Kay's collection (purchased in Tucson in 1983 from van Scriver). It is a fine display specimen and was a centerpiece in her special drawers of top German materials. As to the scientific naming mess, briefly these were classified as Clinomimetite, but the nomenclature was changed back to Mimetite 20 years later. MINDAT: named clinomimetite in 1991 by Yongshan Dai, John M. Hughes, and Paul Brian Moore for its monoCLINic structure and chemical identity with mimetite. Renamed by Pasero et al. (2010) as a polymorph of Mimetite referred to now as Mimetite-M. To me as a collector, that all makes little sense for the back and forth - CLINO sounded reasonable. It is nevertheless, the oldest known confirmed mimetite find!

NOTE From further research by the current curator of Minerals at the Vienna Museum:

This mimetite specimen which is published in “The Mineralogical Record”, Vol.38,3-4,2007,p.133, Fig.14  was exchanged in 26th July 1982 with Curt van Scriver less than 14 days before his tragic death in an auto accident. The NHMW archive still has the acquisition record of "1806.V.9:V."  It was purchased before 1806 from a (local mineral dealer) named Mohr or Moor, and was labelled as "An.75, Arseniksaure Gelbe Bleierze; Johanngeorgenstadt"

This Mohr is mentioned in Mineralogical Record's History of Mineral Collecting  (Wilson, 1995): Mohr, Jacob (late 1700’s), Austrian mineral dealer in Vienna, mentioned by Stuetz (1807). He and his brother specialised in French and Scandinavian specimens; traveled in Siberia in 1812-1817.