-
Aphanites (adj.
aphanitic; from
Ancient Gr**** αφανης (aphanḗs) 'invisible') are
igneous rocks that are so fine-grained that
their component 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...
- silica-rich of
volcanic rocks. It is
generally gl****y or fine-grained (
aphanitic) in texture, but may be porphyritic,
containing larger mineral crystals...
- main
types of
textures are phaneritic,
aphanitic, porphyritic, gl****y, pyroclastic, and pegmatitic.
Aphanitic (a = not,
phaner = visible) rocks, in contrast...
- bomb
Lapilli Volcanic ash
Volcanic rocks are
usually fine-grained or
aphanitic to gl**** in texture. They
often contain clasts of
other rocks and phenocrysts...
-
volcanic eruptions,
rapidly solidifies.
Hence such
rocks are fine-grained (
aphanitic) or even gl****y.
Basalt is the most
common extrusive igneous rock and...
- 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...
-
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...
- (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,...
-
distinguished with the
unaided human eye. In contrast, the
crystals in an
aphanitic rock are too fine-grained to be identifiable.
Phaneritic texture forms...
