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- Animal shell (2105 bytes)
3: ...be shells. It is sometimes said that shells are made of [[chitin]], but these are unrelated materials ...
5: ...<nowiki>CaCO</nowiki><sub>3</sub>) in the form of platy [[crystal]]s.
7: ...nst [[parasite|parasitic organisms]] and damaging detritus.
9: When a mollusk is invaded by a [[parasite]] or is irritated by a foreign o... - Metamorphic rock (7141 bytes)
1: ...sedimentary rock]], [[igneous rock]] or another older metamorphic rock.
3: ...ssembly ([[metamorphic facies]]). They are formed deep beneath the Earth's surface by great stresses a...
5: ...he temperatures and pressures that occur at great depths within the Earth's crust.
10: ... the process of metamorphism. These minerals include [[kyanite]], [[staurolite]], [[sillimanite]], [[a...
18: ... the direction of the force. This results in a banded, or foliated, rock, with the bands showing the c... - Schist (1749 bytes)
3: ...ced. By definition, schist contains more than 50% platy and elongated minerals, often finely interleaved ...
9: ... as intermediate steps. Certain schists have been derived from fine-grained [[igneous rock]]s such as ...
13: ...schists can be split along the plane in which the platy minerals lie.
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