glauconite Min.
(ˈglɔːkənaɪt)
[Named by Keferstein 1828 (in Ger. form glaukonit), f. Gr. γλαυκόν, neut. of γλαυκός adj. (see glaucous) + -ite.]
Hydrous silicate of iron, potassium, and other bases, commonly called green earth.
| 1836 T. Thomson Min. I. 387 Glauconite is employed as a colour by painters. 1851 Richardson Geol. (1855) 179 The glauconite, or fire-stone of the chalk formation. 1865 Lyell Elem. Geol. xvii. (ed. 6) 311 Marls and sands, often containing much green earth, called glauconite. |
Hence glaucoˈnitic a., containing or resembling glauconite.
| 1864 Q. Jrnl. Geol. Soc. XXI. 20 The Glauconitic sands—These sands are of a dark-green colour, and consist of glauconitic and arenaceous grains in a slightly argillaceous paste. 1879 Rutley Study Rocks xiv. 289 The lower portion, termed the grey chalk..is generally slightly glauconitic at the base. |