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Cryptocrystalline is a rock
texture made up of such
minute crystals that its
crystalline nature is only
vaguely revealed even
microscopically in thin...
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microcrystalline or
cryptocrystalline varieties (aggregates of
crystals visible only
under high magnification). The
cryptocrystalline varieties are either...
- hard, fine-grained
sedimentary rock
composed of
microcrystalline or
cryptocrystalline quartz, the
mineral form of
silicon dioxide (SiO2).
Chert is characteristically...
- Flint,
occasionally flintstone, is a
sedimentary cryptocrystalline form of the
mineral quartz,
categorized as the
variety of
chert that
occurs in chalk...
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chrysophrase or
chrysoprasus is a
gemstone variety of
chalcedony (a
cryptocrystalline form of silica) that
contains small quantities of nickel. Its color...
- of the
amorphous character of a mineral, or a material. Amorphous,
cryptocrystalline, and
crystalline materials can all
present conchoidal fracture when...
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carbonate rock Chert – Hard, fine-grained
sedimentary rock
composed of
cryptocrystalline silica Claystone –
Clastic sedimentary rock
composed primarily of...
- (/kælˈsɛdəni/ kal-SED-ə-nee or /ˈkælsəˌdoʊni/ KAL-sə-doh-nee) is a
cryptocrystalline form of silica,
composed of very fine
intergrowths of
quartz and moganite...
- Jasper, an
aggregate of
microgranular quartz and/or
cryptocrystalline chalcedony and
other mineral phases, is an opaque,
impure variety of silica, usually...
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stone tool use and manufacture.
Knapped stone tools are made from
cryptocrystalline materials such as chert, flint, radiolarite, chalcedony, obsidian...
