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Lepidolite is associated with other lithium-bearing minerals like spodumene in pegmatite bodies. It is the major source of the alkali metal rubidium. [13] In 1861, Robert Bunsen and Gustav Kirchhoff extracted 150 kg (330 lb) of lepidolite to yield a few grams of rubidium salts for analysis, and therefore discovered the new element rubidium. [14 ...
The Harding Pegmatite Mine is a former adit mine that extracted lithium, tantalum, and beryllium from a Precambrian pegmatite sill.It ceased operations in 1958 and its owner, Arthur Montgomery, donated it to the University of New Mexico, which runs the site as an outdoor geology laboratory with mineral collecting permitted on a small scale.
Greenfield Mills, near Howe. Family owned and operating. Iowa. Pine Creek Gristmill, Wildcat Den State Park, near Muscatine; Kentucky. Mill Springs Overshot Waterwheel located at Mill Springs Park. The current mill built in 1877 on the site of a previous mill. Currently owned and operated as a park by the United States Army Corps of Engineers.
171–177 S. High Street, known as the Old Lazarus Block, was constructed in the 19th century. In 1858, five-term Columbus mayor George J. Karb was born on the building's third floor. The building was remodeled sometime between 1911 and 1915. [6] [7] In the 1880s, Pfaff & Co. operated at this address, selling gas fixtures, glass, and queensware ...
Waterlogged wood is a wooden object that has been submerged or partially submerged in water and has affected the original intended purpose or look of the object. . Waterlogged wood objects can also include wood found within moist soil from archaeological sites, underwater archaeology, maritime debris, or damaged w
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The conservation and restoration of wooden artifacts refers to the preservation of art and artifacts made of wood. Conservation and restoration in regards to cultural heritage is completed by a conservator-restorer. Carved wooden figure; Woman with child Wellcome L0036701. See also Conservation and restoration of wooden furniture
When free hydroxyl groups are transformed to acetoxy groups, the ability of the wood to absorb water is greatly reduced, rendering the wood more dimensionally stable and, because it is no longer digestible, extremely durable. In general, softwoods naturally have an acetyl content from 0.5 to 1.5% and more durable hardwoods from 2 to 4.5%.
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