ˈglȯkəˌnīt noun
( -s )
Etymology: German glaukonit, from Greek glaukon (neuter of glaukos ) + German -it -ite
: a mineral approximately K 15 (Fe,Mg,Al) 4-6 (Si,Al) 8 O 20 (OH) 4 consisting of a dull green earthy and micaceous iron potassium silicate occurring abundantly in greensand