chamosite

chamosite

[sham-uh-zahyt]
noun
a mineral of the chlorite group, hydrous aluminum silicate of iron, occurring in gray or black crystals in oolitic iron ore.

Origin:
1825–35; variant of camoisite, named after Chamoison in the Valais, Switzerland, where found; see -ite1

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WordNet
chamosite

noun
a greenish grey or black silicate of iron and aluminum 
WordNet® 3.0, © 2006 by Princeton University.
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