File:Basalt_12_(48674276333).jpg · Wikimedia Commons · See Wikimedia Commons

EntityQ43338· pop 97· linked from 5,268 articles

玄武岩

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Key facts

Rock.name: Basalt
Rock.type: Igneous
Rock.image: Basalt 12 (48674276333).jpg
Rock.composition: Mafic: plagioclase, amphibole, and pyroxene
Rock.composition_secondary: Sometimes feldspathoids or olivine

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Wikidata facts

Subclass of: volcanic rock
Named after: Black Tortoise
Image: Basalto afanitico e quasi afirico per i rari e minuti fenocristalli.jpg

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Commons category: Basalt
topic's main category: Category:Basalt
Commons gallery: Basalt
described by source: Pauly–Wissowa
on focus list of Wikimedia project: Wikipedia:Vital articles/Level/4
exact match: purl.obolibrary.org/obo/ENVO_01000236

Sources (5)

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Article · 日本語

玄武岩（げんぶがん、英: basalt）は、苦鉄質火山岩の一種。深成岩の斑れい岩に対応する。火成岩は全岩化学組成（特にSiO2の重量%）で分類され、そのうち玄武岩はSiO2が45 - 52%で斑状組織を有するもの。斑晶は肉眼で見えないほど小さい場合もある。肉眼での色は黒っぽいことが多いが、ものによっては灰色に見えることもあり、また含まれる鉄分の酸化によって赤 - 紫色のこともある。

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