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basalt
Definitions
[ˈbaslt], (Noun)
Definitions:
- a dark fine-grained volcanic rock that sometimes displays a columnar structure, typically composed largely of plagioclase with pyroxene and olivine
Phrases:
Origin
:
early 17th century (in the Latin form): from Latin basaltes (variant of basanites), from Greek basanitēs, from basanos ‘touchstone’
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definition by Oxford Dictionaries