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Claystone – Clastic sedimentary rock composed primarily of clay-sized particles. Coal – Combustible sedimentary rock composed primarily of carbon. Conglomerate – Sedimentary rock composed of smaller rock fragments. Coquina – Sedimentary rock that is composed mostly of fragments of shells.
4 Rocks. 5 Chatoyant gems. 6 Asterism. 7 See also. 8 References. 9 Further reading. Toggle the table of contents. List of gemstones by species. 6 languages.
Deep green isolated fluorite crystal showing cubic and octahedral faces, set upon a micaceous matrix. Fabianite. Farneseite. Faujasite (subgroup of zeolites) Faustite. Fayalite (olivine group) Feldspar (mineral group) Feldspathoid (mineral group) Felsőbányaite.
Limestone pavement – Natural karst landform consisting of a flat, incised surface of exposed limestone. Mesa – Elevated area of land with a flat top and sides, usually much wider than buttes. Mushroom rock – Naturally occurring rock whose shape resembles a mushroom. Natural arch – Arch-shaped natural rock formation.
Crystals of serandite, natrolite, analcime, and aegirine from Mont Saint-Hilaire, Quebec, Canada. Mineralogy is an active science in which minerals are discovered or recognised on a regular basis. Use of old mineral names is also discontinued, for example when a name is no longer considered valid. Therefore, a list of recognised mineral species ...
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.
The Neoproterozoic corresponds to Precambrian Z rocks of older North American stratigraphy. Ediacaran: The youngest geologic period within the Neoproterozoic Era. The "2012 Geologic Time Scale" dates it from 538.8 to 635 Ma. In this period the Ediacaran biota appeared. Cryogenian: The middle period in the Neoproterozoic Era: 635-720 Ma.
Z Rock was a nationally syndicated radio network based in Dallas, Texas, United States that, from the mid-1980s through the mid-1990s, played heavy metal and hard rock music. . The format was one of several 24-hour satellite-delivered music formats offered by the pioneering Satellite Music Network (a company which in 1989 merged with ABC Radio Networks and later became Cumulus Media Networ