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2. Mineral collecting - Wikipedia

   en.wikipedia.org/wiki/Mineral_collecting

   Mineral collectors find a variety of reasons to collect minerals. Many minerals are strikingly beautiful and collected for their aesthetic value. Others collect to learn more about mineralogy, the local mining industry and/or local geology. Some simply enjoy exploring the outdoors and socializing and trading with other mineral collectors.

3. List of natural history dealers - Wikipedia

   en.wikipedia.org/wiki/List_of_natural_history...

   Advertisement Ernst A. Bottcher. Natural history specimen dealers had an important role in the development of science in the 18th, 19th and early 20th centuries. They supplied the rapidly growing, both in size and number, museums and educational establishments and private collectors whose collections, either in entirety or parts finally entered museums.

4. Amateur geology - Wikipedia

   en.wikipedia.org/wiki/Amateur_geology

   The hammer end is for breaking rocks, and the pick end is mainly used for prying and digging into crevices. The pick end of most rock hammers can dull quickly if struck onto bare rock. Rock collectors also use a sledgehammer to break hard rocks. Collectors usually search for rocks in quarries, road cuts, rocky hills, mountains, and streams.

5. Rare-earth mineral - Wikipedia

   en.wikipedia.org/wiki/Rare-earth_mineral

   This mineral is rare because it contains a large number of rare elements. [19] This mineral can be classified as semi-soluble salt due to its limited solubility in water and capacity to form ionic bonds. [19] Bastnäsite deposits are found in China and the USA. [19] Bastnäsite is a mineral that originates from Madagascar.

6. William Pinch - Wikipedia

   en.wikipedia.org/wiki/William_Pinch

   William "Bill" Wallace Pinch (August 15, 1940 – April 1, 2017) [1] was a mineralogist from Rochester, New York.The Mineralogical Association of Canada has an award named after him, the Pinch Medal, "to recognize major and sustained contributions to the advancement of mineralogy by members of the collector-dealer community."

7. Emery (rock) - Wikipedia

   en.wikipedia.org/wiki/Emery_(rock)

   Emery is a granular rock used to make an abrasive powder. It largely consists of corundum (aluminium oxide), mixed with other minerals such as the iron-bearing spinels, hercynite, and magnetite, and also rutile . Industrial emery may contain a variety of other minerals and synthetic compounds such as magnesia, mullite, and silica.