terminology in Geology

Jun 28th, 2015
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Absorption Spectrum : Colors of light least absorbed combining to produce the color of the stone. The stone, when viewed by spectroscope, will show as dark bands in characteristic positions the colors most strongly absorbed. Acicular : Needlelike; refers to the growth of a mineral in long and slender crystals. Adamantine : Very high luster.

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Absorption Spectrum: Colors of light least absorbed combining to produce the color of the stone. The stone, when viewed by spectroscope, will show as dark bands in characteristic positions the colors most strongly absorbed.Acicular: Needlelike; refers to the growth of a mineral in long and slender crystals.Adamantine: Very high luster.Aggregate: Intergrowth of several crystals, these may be globular, fibrous, reniform, or radiating fibrous.Adularescence: The sheen of color seen in moonstone and other feldspars of the adularia variety.Allochromatic Minerals: Minerals that are colorless when pure, the color coming from coloring agents, most of which are, cobalt, copper, chromium, titanium, vanadium, manganese, and iron. Examples of this are beryl,corundum, quartz, and spinel.Alluvium: Continental sediments due to transport and deposition of gravel, sand, and clay by running water, rivers, and streams. (See alluvial)Alpha rays: Helium atoms with double positive charge.Alpine cavities (vugs) :Hollows in silicate rock, they may be partially filled with mineral formations.Alteration pseudomorph : One mineral has been replaced by another that is unrelated while preserving the original crystal form.Amorphous: Has no characteristic external form or shape. The arrangement of the atoms and molecules are irregularAmphiboles: A group of closely related, dark colored rock forming silicate minerals, as in, actinolite, hornblende.Anisotropic: when

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