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a. A monoclinic and orthorhombic mineral, (OH)2 (Mg,Al)4
(Si,Al)8 O20 .8H2 O ; fibrous; in desert soils.
b. A general name for lightweight fibrous clay minerals showing
significant substitution of aluminum for magnesium; characterized by
distinctive rodlike shapes under an electron microscope.
Syn: attapulgite
Source:
Dictionary of Mining, Mineral, and Related Terms
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