411 REFERENCE · Wiktionary
Glaukonit
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
German
Etymology
Coined in 1828 by Christian Keferstein, from de grc γλαυκός blue-green + de -it.
Noun
m
glauconite (a dull green, often granular, mica-group mineral, a hydrous phyllosilicate of iron and potassium)