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The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.
Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however.
Stone tools have been used for millions of years by humans and earlier hominids. The Stone Age was a period of widespread stone tool usage. [39] Early Stone Age tools were simple implements, such as hammerstones and sharp flakes. Middle Stone Age tools featured sharpened points to be used as projectile points, awls, or scrapers.
Anyolite (metamorphic rock - zoisite, ruby, and hornblende) Aquamarine (light blue variety of beryl) Argentite (high temperature form of acanthite) Asbestos (fibrous serpentine- or amphibole minerals) Auerlite (variety of thorite) Avalite (chromian variety of illite) Aventurine (variety of quartz)
Oolite – Sedimentary rock formed from ooids; Rag-stone – Work done with stones that are quarried in thin pieces; Shelly limestone – Limestone containing many fossils; Travertine – Form of limestone deposited by mineral springs; Tufa – Porous limestone rock formed when carbonate minerals precipitate out of ambient temperature water
Replica of the Stone and Coronation Chair kept in a house museum. Stone of the Guanches: Afur, Tenerife, Canary Islands, Spain: Engraved tuff stone stele related to the process of Guanche mummification. Stone of Tmutarakan: Hermitage Museum, Saint Petersburg, Russia: Marble stone with an 11th-century inscription discovered in 1792. Sunday Rock
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