Definition of basalt
: a dark gray to black dense to fine-grained igneous rock that consists of basic plagioclase, augite, and usually magnetite
basalticplay \bə-ˈsȯl-tik\ adjective
Recent Examples of basalt from the Web
Sierra Silica Resources, Oroville: $174,281 for bags of basalt, Feb. 17.
The desert canyon of green trees and brown vegetation suddenly morphs into a black basalt beauty, with massive drop-offs, jagged ridges and a giant meandering river that appears to be miles away.
Also of note is a basalt-lava cross on a small mound, marking one of the three original battlefield bunkers.
Kenyan TV has posted some great video of the rift eruption that is producing tall fire fountains of the especially low viscosity (unlike what the video says) high-potassium basalts erupted from Nyamuragira.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'basalt'. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
Origin and Etymology of basalt
Latin basaltes, manuscript variant of basanites touchstone, from Greek basanitēs (lithos), from basanos touchstone, from Egypt bḫnw
First Known Use: 1601See Words from the same year
BASALT Defined for English Language Learners
Definition of basalt for English Language Learners
: a type of dark gray to black rock
Seen and Heard
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