ripidolite

noun

ri·​pid·​o·​lite

rə̇ˈpidᵊlˌīt,

rīˈp-

plural -s

: a mineral (Mg,Fe)₉Al₆Si₅O₂₀(OH)₁₆ consisting of a basic magnesium iron aluminum silicate of the chlorite group

Word History

Etymology

German ripidolith, irregular from rhipid- + -lith -lite

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