- A
vitrophyre is a
porphyritic volcanic rock in
which phenocrysts are
embedded in a gl****y matrix.
Vitrophyres are
contrasted from
typical porphyritic...
-
tools Obsidian hydration dating –
Geochemical dating method Stone tool
Vitrophyre – Gl****y
volcanic rock
Yaxchilan Lintel 24 –
Ancient Maya
limestone carving...
-
Lunar breccias range from gl****y
vitrophyre melt rocks, to gl****-rich breccia, to
regolith breccias. The
vitrophyres are
dominantly gl****y
rocks that...
-
Rhyolites that cool too
quickly to grow
crystals form a
natural gl**** or
vitrophyre, also
called obsidian.
Slower cooling forms microscopic crystals in the...
-
location for this rock. On
Pantelleria the rock is
usually found as a
vitrophyre containing phenocrysts of
anorthoclase or sanidine.
Quartz is
found only...
- plagioclase-group
feldspar is
oligoclase Tuff – Rock
consolidated from
volcanic ash
Vitrophyre – Gl****y
volcanic rock - Gl****y
igneous rock with
phenocrysts Websterite –...
- The
Newbury Volcanic Complex, also
known as the
Newbury Formation or the
Newbury Volcanics, is a 16 km long, 3 km wide
strip of
volcanic materials and...
- may have gl****y
zones near the base and top,
called lower and
upper '
vitrophyres', but
central parts are
microcrystalline ('lithoidal'). The mineralogy...
-
Pitchstones may also
contain phenocrysts, in
which case it is a form of
vitrophyre.
Pitchstone has a
resinous lustre, or
silky in some cases, and a variable...
-
vitrinite A
group of
macerals that are the most
common component of coal.
vitrophyre See pitchstone.
volcanic Rocks that have
crystallised from
magma poured...
