Rocks and Minerals Dictionary: A. African emerald African emerald is a misnomer for green fluorspar that is mined in South Africa; it is not an emerald at all.
A rock is a aggregation of solid matter, a random conglomerate of minerals. The earth's crust is made of rock. There are three types of rock: igneous, sedimentary, and metamorphic. Petrology is the scientific study of rocks. rock crystal Rock crystal is a transparent, crystalline mineral. Rock crystal is the purest form of quartz and a semi
Rocks and Minerals Dictionary: G. garnet Garnets are any of a group of semi-precious silicate stones that range in color from red to green (garnets occur in all colors but blue).
Rocks and Minerals Dictionary: I. Advertisement. EnchantedLearning is a user-supported site. As a bonus, site s have access to a banner-ad-free version of the site, with print-friendly pages. If the rock or mineral term you are looking for is not in the dictionary
Rocks and Minerals Dictionary: K. K-T extinction The K-T extinction was the mass extinction that occurred 65 million years ago, at the boundary of the Cretaceous and Tertiary periods.
Aug 15, 2013· Rocks are made of minerals, and minerals stand alone. Classification Differences Another way to distinguish between rocks and minerals is by their classification systems.
Rocks are made of minerals, and minerals stand alone. Classification Differences Another way to distinguish between rocks and minerals is by their classification systems.
A mineral is a naturally-occurring substance formed through geological processes that has a characteristic chemical composition, a highly ordered atomic structure and specific physical properties. A rock is a naturally occurring aggregate of minerals and/or mineraloids.Rocks do not have a definite chemical composition.
Mineral definition, any of a class of substances occurring in nature, usually comprising inorganic substances, as quartz or feldspar, of definite chemical composition and usually of definite crystal structure, but sometimes also including rocks formed by these substances as well as certain natural products of organic origin, as asphalt or coal.
Rock-forming minerals Definition. Minerals are the building blocks of rocks. Geologists define a mineral as: A naturally occurring, inorganic, solid, crystalline substance which has a fixed structure and a chemical composition which is either fixed or which may vary within certain defined limits.
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Rock definition, a large mass of stone forming a hill, cliff, promontory, or the like. See more.