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The Main entrance to the Mineral Show The presentation of a new edition of Mineralientage by the Keilmann's family. Mineralientage München is the largest mineral show in Europe, held in the Bavarian city of Munich (München in German), a few weeks after the Oktoberfest. It began in 1964 and celebrated its 50th edition in 2014. [1]
Gehrig and Brooks went on to found the Montreal Gem and Mineral Club in 1957. [1] That same year, Brooks opened his first shop, which he sold in 1961. [ 1 ] Brooks and his wife Jean then travelled, visiting gem sources around the world, including mining for opals , in Andamooka, South Australia . [ 1 ]
It was donated to the museum by the financier J.P. Morgan. The thin, radiant, six pointed star, or asterism, is created by incoming light that reflects from needle-like crystals of the mineral rutile which are found within the sapphire. The Star of India is polished into the shape of a cabochon, or dome, to enhance the star's beauty. [12]
In subsequent decades, it was augmented primarily by gifts, including Andrew Carnegie's 1904 donation of the notable mineral collection of William W. Jefferis of West Chester, Pennsylvania (about 12,000 specimens), and a donation in 1902 of 2,600 gems from John L. Lewis, President of the Lewis Foundry & Machine Company located in Groveton ...
Another famous 16th century mineral collector was Holy Roman Emperor Rudolf II (1552–1612). He built a large mineral collection while employing Anselmus de Boodt (c. 1550 –1634), his court physician and another avid mineral collector, to expand and tend his collections. After Rudolf's death his collection was dispersed. [1]
A rockhound's tools: a geologist's hammer and loupe. The amateur geologist's principal piece of equipment is the geologist's hammer. This is a small tool with a pick-like point on one end, and a flat hammer on the other. The hammer end is for breaking rocks, and the pick end is mainly used for prying and digging into crevices.
Llanite is a porphyritic rhyolite with distinctive phenocrysts of blue quartz (a rare quartz color) and perthitic feldspar (light grayish-orangeish). The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals.
The earliest donations were noted in the museum's annual report on June 30, 1899, when the institution reported that Dr. L. T. Chamberlain gave them two cut Yogo sapphires and 21 other sapphires for their Dr. Isaac Lea gem and mineral collection. [91] The record-setting 10.2-carat (2.04 g) cut Yogo is also held by the Smithsonian.