Siderite (rare old classic) American Musuem & Kay Robertson Coll.

Item Description

An outstanding and RARE old-time siderite specimen from the Kay Robertson Collection # 4520. Intergrown, large, lustrous, translucent, brownish olive-green, compound siderite rhombs compose this very aesthetic and sculptural specimen. The impressive large rhomb is 4.5 cm on the diagonal. Pristine. Well-crystallized siderite specimens are rare from this historic old Au-Ag-Fe-Sb mining district known since the Middle Ages (around 1200) until the late 1900s. The mines are now extinct. Kay acquired this exceptional siderite from the American Museum in the mid-1960s. Her label says Nadabula, which does not exist in the Czech Republic or Slovakia, according to MINDAT. No siderite specimen photos in the MINDAT photo gallery for the Czech Republic resemble this piece. Only specimens from Roznava in Slovakia do. It strongly resembles superb siderites from Neudorf, Germany or Isere, France. High praise indeed! Undoubtedly old-time material.