Siderite on Galena Orthoclase A very attractive larger Spinel

A very attractive larger Spinel crystal from this historic locality in southeast Asia

and certainly hard to find from this particular locality

if one were to shine a very bright light

The species was named after Basilius Valentinus

but finding true bicolor twins is off the charts

Siderite on Galena Orthoclase A very attractive larger SpinelFrom the collection of well known Colorado mineral collector, George Robertson. My dad traded this piece from George in the early 1980s. The piece features dozens of rosettes of tan Siderite which are sitting atop rather lustrous, well formed, cuboctahedra of Galena on Sphalerite and Pyrite matrix. The Julia Fisk Mine is one of the more notable specimen producing mines in the Leadville District, especially since it was one of the few Leadville mines