Microcline (var: Amazonite)

Microcline (var: Amazonite)This thumbnail sized group features a few sharp, well formed, rich blue green colored Amazonite crystals with unusually etched altered reddish brown sections on the terminations. This particular style is rarely seen in Amazonite and makes for a lovely color contrast. Collected by my maternal grandfather, Dave Bergman in 1981, and it resided in his collection until he passed in 2025. Grandpa Dave was the foreman and primary person in charge of

The Brookites measure up to 7 mm long and are notably free-standing (not lying flat) on the matrix

this cabinet sized display specimen is a quintessential Gilman sulfide / carbonate association piece

The species was named after Basilius Valentinus

The largest crystal on this specimen is one of the biggest Augelites that I have seen from Bolivia

The quality of the Cassiterites on this specimen is outstanding

lustrous blades measuring up to 1

Specimen # BOL711B127

The Siderite from this mine ranges in its chemistry from the far iron end to an iron/manganese mix

The reverse side of the specimen shows exceedingly rare

This specimen is not only an impressive

Specimen# CO712B95

metallic grey color bladed crystals