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Idar-Oberstein was historically a center which made use of agate on an industrial scale. Originally, locally found agates were used to make all types of objects for the European market, but it became a globalized business around the turn of the 20th century. Idar-Oberstein began to import large quantities of agate from Brazil, as ship's ballast.
Lake Superior agate is a type of agate found primarily near the shores of Lake Superior. It can also be found in interior regions of the U.S. states of Minnesota , Michigan , Wisconsin , Iowa , Nebraska , Kansas , and Missouri , and in the Canadian province of Ontario .
At this point, marbles were made in mills and quarries by polishing small fragments of real stone like marble, agate, alabaster, limestone, and even brass. It is unknown where marbles were first manufactured. [ 6 ]
[citation needed] Although dzi type agate beads were made in the Indus Valley during the Harappan period and at various locations rich in agate deposits in India, such as in Khambhat, since their Neolithic periods, the earliest archaeologically controlled find of an agate bead with dzi style decoration of straight and curved lines and circular ...
Stones such as agate, cairngorm citrine, jasper, malachite and granite were mined in the hills of Scotland and were popular in jewellery. Agate was made popular in Scottish jewellery styles in the 19th century, popularised by Queen Victoria. [13] [self-published source?] These stones are often found on bracelets, pendants and brooches.
Ancient and Renaissance cameos were made from semi-precious gemstones, [3] especially the various types of onyx and agate, and any other stones with a flat plane where two contrasting colours meet; these are "hardstone" cameos.
Fordite, also known as Detroit agate, Motor City agate, [1] paint rock, or paint slag, [2] is a lapidarist term for polished pieces of finely layered paint masses from automobile factories. The masses consist of automotive paint which has hardened sufficiently to be cut and polished.
In the early days of condor agate collecting, a typical month of effort would yield 1 ton of good agates. Currently, excavation is required to find the agates, so an extra effort is needed to supply the ever growing demand for these gems. Initially, the agates were found scattered loose over the landscape and were readily harvested in quantity.
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