GREENSAND • E-FREE TRANSLATION.COM • Definition of Greensand

... hydrography, observed, that the mud forming the sea-bottom at depths of one hundred and fifty fathoms, in 31 deg. 32' N., 79 deg. 35' W., off the Coast of Florida, was "a mixture, in about equal proportions, of Globigerinoe and black sand, probably greensand, as it makes a green mark when crushed on paper." Professor Bailey, examining these grains microscopically, found that they were casts of the interior cavities of Foraminifera, consisting of a mineral known as Glauconite, ...

— Discourses - Biological and Geological Essays • Thomas H. Huxley