roeblingite
noun
roe·bling·ite
ˈrōbliŋˌīt
plural -s
: a mineral supposedly Ca7Pb2H10(SO4)2(SiO4)6 consisting of an acid lead calcium silicate and sulfate occurring in white crystalline masses (hardness 3, specific gravity 3.4)
Word History
Etymology
Washington A. Roebling †1926 American civil engineer + English -ite
First Known Use
1897, in the meaning defined above