Mineral/rock

Derived from or for

Embolite

Greek embole = insert and lithos = stone since it contains both the chloride and bromide of silver

Emerald

Latin smaragdus and Greek smaragdos = emerald, probably of Semitic origin; ancient name applied to a variety of green minerals

Emery

French emeri, Italian smeriglio, and Greek smiris or smeris; akin to the Greek myron = urgent

Epsomite

locality at Epsom, a town near London, England

Erionite (zeolite)

Greek erion = wool alluding to its white wool-like appearance

Euclase

Greek eu = good, well and klasis = a breaking due to its easy cleavage

Eucryplite

Greek eu = good, and concealed due to its mode of occurrence embedded in albite

Eudialyte 

Greek eu = good, well and dialytos = capable of dissolution

Eudidymite

Greek eu = good, well and twin, due to the twinned crystal

Eugsterite  
(Fritzshe's salt)

N.A. 

Europium

Continent of Europe named for Europa, daughter of a king of Phoenicia

Euxenite

Greek for friendly to strangers or hospitable referring to the rare-earth elements it contains