ob·sid·i·an 
(ŏb-sĭdē-ən)
(ŏb-sĭdē-ən)n.
A usually black or banded, hard volcanic glass that displays shiny, curved surfaces when fractured and is formed by rapid cooling of lava.
[Latin obsidiānus, misreading of obsiānus (lapis), Obsian (stone), obsidian, after Obsius, a Roman who supposedly discovered it or a similar mineral.]
- Francis Edgar
- Francis Ferdinand
- Francis Ferdinand
- Francis Ford
- Francis Harry Compton
- Francis Herbert
- Francis I
- Francis II
- Francis Jean Marcel
- Francis Joseph I
- Francis Joseph I
- Francis Nwia Kofi.
- Francis of Assisi
- Francis of Sales
- (Francis) Peyton
- Francis Russell
- Francis Scott
- F(rancis) Scott (Key)
- Francis Xavier
- francium
- Franck
- Franco-
- Franco
- Franco-American
- Franco-Flemish