dioritic

diorite

[dahy-uh-rahyt]
noun
a granular igneous rock consisting essentially of plagioclase feldspar and hornblende.

Origin:
1820–30; < French < Greek dior(ízein) to distinguish (see di-3, horizon) + French -ite -ite1

dioritic [dahy-uh-rit-ik] , adjective
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World English Dictionary
diorite (ˈdaɪəˌraɪt)
 
n
a dark coarse-grained igneous plutonic rock consisting of plagioclase feldspar and ferromagnesian minerals such as hornblende
 
[C19: from French, from Greek diorizein to distinguish (from dia- apart + horizein to define) + -ite1]
 
dioritic
 
adj

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American Heritage
Science Dictionary
diorite   (dī'ə-rīt')  Pronunciation Key 
A gray, coarse-grained plutonic rock. Diorite consists mainly of sodium-rich plagioclase and one or more mafic minerals such as biotite, hornblende, or pyroxene. It is the coarse-grained equivalent of andesite.
The American Heritage® Science Dictionary
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