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Aphanites (adj.
aphanitic; from
Ancient Gr**** αφανης (aphanḗs) 'invisible') are
igneous rocks that are so fine-grained that
their component mineral crystals...
- silica-rich of
volcanic rocks. It is
generally gl****y or fine-grained (
aphanitic) in texture, but may be porphyritic,
containing larger mineral crystals...
- high in
silica and low in
alkali metal oxides. It has a fine-grained (
aphanitic) to
porphyritic texture and is
intermediate in
composition between andesite...
-
Felsite is a
petrologic field term used to
refer to very fine-grained or
aphanitic, light-colored
volcanic rocks which might be
later reclassified after...
- main
types of
textures are phaneritic,
aphanitic, porphyritic, gl****y, pyroclastic, and pegmatitic.
Aphanitic (a = not,
phaner = visible) rocks, in contrast...
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Basalt (UK: /ˈbæsɒlt, -ɔːlt, -əlt/; US: /bəˈsɔːlt, ˈbeɪsɔːlt/) is an
aphanitic (fine-grained)
extrusive igneous rock
formed from the
rapid cooling of...
-
Volcanic gl**** may
refer to the
interstitial material, or matrix, in an
aphanitic (fine-grained)
volcanic rock, or to any of
several types of
vitreous igneous...
- rock
composed mostly of
alkali feldspar. It is
usually light-colored and
aphanitic (fine-grained), with
minor amounts of
mafic minerals, and is
formed by...
- (known as vesicles) at its
surface and inside. This
texture is
common in
aphanitic, or gl****y,
igneous rocks that have come to the
surface of the Earth,...
-
impact on the environment.
Volcanic rocks are
usually fine-grained or
aphanitic to gl**** in texture. They
often contain clasts of
other rocks and phenocrysts...
