bei·del·lite
| \ bī-ˈde-ˌlīt \
plural -s
Definition of beidellite
: a mineral ideally Ca0.16Al3Si3.17O10(OH)2 that is a common constituent of certain clays and consists of basic aluminosilicate with exchangeable calcium, sodium, or other cation
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Merriam-Webster unabridged
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