afwillite
noun
af·wil·lite
ˈaf-wə-ˌlīt
plural -s
: a mineral Ca3Si2O4(OH)6 consisting of a hydrous calcium silicate and occurring in colorless monoclinic crystals (specific gravity 2.6)
Word History
Etymology
Alpheus Fuller Williams †1953 American mining engineer + -ite entry 1
First Known Use
1925, in the meaning defined above