from The Century Dictionary and Cyclopedia
- n. A silicate of aluminium and magnesium, dark-green in color, owing to the presence of protoxid of iron. The mineral is massive or fibrous, the fibers being in stellate groups.
- n. In petrography, a term used by King (1878) to designate a group of volcanic rocks including both rhyolite and basalt.
Sorry, no etymologies found.