Arvidsjaur porphyry
Arvidsjaur porphyry () is a group of igneous rocks of intermediate to felsic composition found near Arvidsjaur in northern Sweden. The Arvidsjaur Porphyry formed 1,870 to 1,880 million years ago during the Paleoproterozoic Era.

Most of the porphyry have well-preserved primary structures and textures which have allowed to interpret much of Arvidsjaur porphyry to be ignimbrites. While much of the porphyryry have rhyolite compositions some parts that are interpreted as lava flows are made up of andesite with plagioclase phenocrysts.
Q42045
igneous rock
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Q1666229
intermediate
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Q847257
felsic
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Q1026498
Arvidsjaur
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Q34
Sweden
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Q20764
million years ago
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Q193738
Paleoproterozoic Era
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Q337238
porphyry
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Q4488518
textures
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Q256438
ignimbrite
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Q190727
rhyolite
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Q40157
lava flow
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Q181908
andesite
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Q714830
plagioclase
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Q383481
phenocryst
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Q85743237
Arvidsjaur porphyry
UNK
Q85743237
Arvidsjaur porphyry
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subclass of
subclass of
country