basanite

[bas-uh-nahyt, baz-]
noun Petrography.
a basaltic rock composed chiefly of plagioclase, olivine, and augite.

Origin:
1745–55; < Latin basanītēs; see basalt

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basanite (ˈbæsəˌnaɪt)
 
n
a black basaltic rock containing plagioclase, augite, olivine, and nepheline, leucite, or analcite, formerly used as a touchstone
 
[C18: see basalt]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
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basanite

extrusive igneous rock that contains calcium-rich plagioclase feldspar (usually labradorite or bytownite), feldspathoid (usually nepheline or leucite), olivine, and pyroxene (titanaugite). Basanite grades into tephrite, which contains no olivine.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The suite of basanite clasts is only slightly larger with four samples.
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