DIABASE
Etymology
Noun
diabase (countable and uncountable, plural diabases)
(geology) A fine-grained igneous rock composed mostly of pyroxene and feldspar.
Synonyms
• dolerite
Anagrams
• Abadies
Source: Wiktionary
Di"a*base, n. Etym: [F. diabase, fr. Gr. (Min.)
Definition: A basic, dark-colored, holocrystalline, igneous rock,
consisting essentially of a triclinic feldspar and pyroxene with
magnetic iron; -- often limited to rocks pretertiary in age. It
includes part of what was early called greenstone.
Source: Webster’s Unabridged Dictionary 1913 Edition