Mineraloid
A
mineraloid
is a
mineral
-like substance that does not demonstrate crystallinity. Mineraloids possess chemical compositions that vary beyond the generally accepted ranges for specific minerals. For example,
obsidian
is an
amorphous
glass
and not a
crystal
.
Jet
is a dense form of
coal
.
Opal
is another mineraloid.
See also
List of minerals
Mineraloids are listed alphabetically after minerals.
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