from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A silicate mineral in which aluminum replaces some of the silicon in the SiO4 component.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun inorganic chemistry Any of many
silicate minerals, such as feldsparand zeolite, in which a proportionof the Si4+ ionsare replaced by Al3+, the excess negative chargebeing balanced by extra sodium, potassiumor calciumions.
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