wol·las·ton·ite | \ ˈwu̇-lə-stə-ˌnīt 
, ˈwä- \
, ˈwä- \Definition of wollastonite
: a triclinic mineral consisting of a native calcium silicate occurring usually in cleavable masses
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Time Traveler for wollastonite
The first known use of wollastonite was in 1823
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