-
Felsite is a very fine-grained
volcanic rock that may or may not
contain larger crystals.
Felsite is a
field term for a light-colored rock that typically...
- is very
finely crystalline, or even cryptocrystalline,
resembling the
felsitic matrix of many acid rocks. It is
essentially metamorphic and
occurs with...
-
crystals exist in a fine-grained matrix,
usually of micro-crystalline or
felsitic structure. In specimens, the
quartz appears as
small rounded, clear, greyish...
- percent. The
dacite volcanic plugs, lava domes,
intrusive sheets, and
felsitic rhyolite-dacite
between Morro Rock and
Islay Hill are part of the Morro...
- tridymite; but in many
dacites it is
largely vitreous,
while in
others it is
felsitic or cryptocrystalline.
Dacite usually forms as an
intrusive rock such as...
-
appears near Tal-y-foel
Ferry on the
Menai Strait. A
patch of rhyolitic/
felsitic rocks forms Parys Mountain,
where copper and iron
ochre have been worked...
-
ignimbrites with
tuffaceous sediments at the base outcrops;
andesitic rocks and
felsitic late
Early Cretaceous conglomerate, sandstone, tuff,
sandy tuff "tobalítica"...
-
areas of deposition. The
tectonic processes were
accompanied by an
intense felsitic volcanism which was the
origin of many
volcanic rock formations, predominantly...
-
compose the
whole m****; more
usually they are
surrounded by a gl****y or
felsitic base. When
obsidians are devitrified, the
spherulites are
often traceable...
-
formation contains Volcano-clastic rock with
interbeds of
purple conglomerate,
felsitic porphyry,
quartz porphyry,
tuffite and
andesite intercalated with rhyolitic...
