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Volcanic gl**** is the
amorphous (uncrystallized)
product of
rapidly cooling magma. Like all
types of
gl****, it is a
state of
matter intermediate between...
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Obsidian (/əbˈsɪdi.ən, ɒb-/ əb-SID-ee-ən ob-) is a
naturally occurring volcanic gl**** formed when lava
extruded from a
volcano cools rapidly with minimal...
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Volcanic ash
consists of
fragments of rock,
mineral crystals, and
volcanic gl****,
produced during volcanic eruptions and
measuring less than 2 mm (0.079 inches)...
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consists mainly of
shards of
volcanic gl****, and tuff
formed predominantly from
gl**** shards is
described as
vitric tuff. The
gl**** shards are
typically either...
- in its
powdered or dust form, is a
volcanic rock that
consists of
extremely vesicular rough-textured
volcanic gl****,
which may or may not
contain crystals...
- pozzolana,
which can only be used for
pozzolans of
volcanic origin,
primarily composed of
volcanic gl****.
Pozzolanas such as
Santorin earth were used in...
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rapid cooling (quenching) of the
molten form. Some gl****es such as
volcanic gl**** are
naturally occurring, and
obsidian has been used to make arrowheads...
-
including knives, out of obsidian,
natural volcanic gl****. From the 1920s
until the 1940s, Dur-X
gl**** fruit and cake
knives were sold for use in kitchens...
- Tachylyte – Form of
basaltic volcanic gl****Pages
displaying short descriptions of
redirect targets –
Essentially a
basaltic gl**** Tephriphonolite – Type of...
-
stratigraphy and tephrochronology,
completely devitrified (weathered
volcanic gl****) ash-fall beds are
sometimes also
referred to as "K-bentonites" (the...
