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Dave Bergman in 1981
A nice representative piece from this famous discovery
Alpine Apatites are not terribly common and are certainly one of the more desirable species for Alpine mineral collectors
Specimen # BOL711B249
antimony sulfosalt Franckeite consisting of somewhat "sword"-shaped crystals oriented into spherical aggregates which are sitting on matrix
Chrysoberyl (var: Alexandrite) (color-changing twin) Goddard & Mihelic and Groben Dave Bergman in 1981Alexandrite is one of the most well known color changing minerals varieties of species extant. As a matter of fact, when we refer to other color changing minerals varieties, the term "Alexandrite Type" effect is often used to describe the color change. Alexandrite is not actually a species, but rather the color changing variety of Chrysoberyl, first discovered in Russia in the 1830 was and named after Tsar Alexander II. Even though the material has
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