Pyrrhotite with Siderite
Morro Velha Mine, Nova Lima, Iron Quadrangle
4.5 x 3.8 x 1.3 CM (miniature)
Worldwide mix summer
An exceptionally fine, bright metallic hexagon of Pyrrhotite dusted with a few small Siderite crystals. Ex Larry Conklin, Terry Szenics collection. In excellent condition, this is an fairly old vintage Brazilian specimen from Morro Velha, and is the sharpest with the best luster I have seen. Morro Velha has the distinction of being the longest running Gold mine in the world, it is well known for good Siderite specimens but Pyrrhotites of any size are rare. This is a nice Pyrrhotite from anyplace but incredible for Brazil. In excellent condition.
A well formed cluster of Pyrrhotite crystals showing the in process alteration on several faces. The terminations are unaltered and have the typical brassy color. This is a 1960 vintage specimen from Santa Eulalia which at that time produced many Pyrrhotites. These are now rare on the market. In good complete condition although the main crystal shows separations from altering, and would have eventually split apart, so this shows well a midstage transition.
An oddity from the great Yaoganxian mine, sharp rosettes of Pyrhotite (rare at this locale) that are coated by secondary Sulphides and associated with Chalcopyrite and Pyrite. The Pyrrhotite has been partly or entirely replaced by what is likely pyrite but could also be Chalcopyrite. Both species are on the speciems matrix. Delicate and well formed this was part of a small find we obtained at the mine in 2003. I have not seen these since then. Uncommon and a nice example for any good Yaogangxian suite.
Calcite xls with Siderite coating
Dalnegorsk, Kavalerovo Mining District
Primorsky Kray, Far Eastern Region,
6.8 x 5.6 x 3.6 CM (cabinet)
Post Tucson 2015
A delicate and very attractive Dalngorsk oddity. Thin Calcite crystals showing multi phase hexagonal structures that are coated with iridescent Siderite. The luster and color are especially attractive. Some few edges have very small chips, most are pristine and overall this displays well. A few tiny Siderite pseudo after calcite balls are on the matrix as well. There were not many of these found and none to be seen on the market now.