alkaline earths

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alkaline earths

alkaline earths , oxides of the alkaline-earth metals , especially of calcium, strontium, and barium. They are not readily soluble in water and form solutions less basic than those of alkalies.

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alkaline rock

A Dictionary of Earth Sciences | 1999 | | Â© A Dictionary of Earth Sciences 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

alkaline rock Igneous rock containing a relatively high concentration of the alkali (lithium, sodium, potassium, rubidium, caesium, and francium) and alkaline earth metals (magnesium, calcium, strontium, barium, and radium). Both silica-saturated and silica-undersaturated varieties exist, expressed in the presence of alkali feldspars and feldspathoids respectively. Alkali ferromagnesian minerals are usually present, and their identity depends on the composition of the rock. Igneous rocks of the alkaline suite span the composition range from basic to acid, and may be intrusive or extrusive.

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AILSA ALLABY and MICHAEL ALLABY. "alkaline rock." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (December 8, 2009). http://www.encyclopedia.com/doc/1O13-alkalinerock.html

AILSA ALLABY and MICHAEL ALLABY. "alkaline rock." A Dictionary of Earth Sciences. 1999. Retrieved December 08, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-alkalinerock.html

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