
1) Monoclinic mineral
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https://www.crosswordclues.com/clue/coesite

a high-pressure polymorph (crystal form) of silica, silicon dioxide (SiO2). It has the same chemical composition as the minerals cristobalite, ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/c/105
(Silicon Dioxide) Coesite is a polymorph of quartz , meaning that it is composed of the same chemistry, SiO 2 , but has a different structure. Both quartz and coesite are polymorphs with all the members of the Quartz Group which also include cristobalite , tridymite and stishovite . Well formed crystals are very rare ...
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https://www.encyclo.co.uk/local/23719

a rare form of silicon dioxide, a denser polymorph of quartz, originally synthesized from quartz at high temperatures and pressures: later discovered in nature. Cf. stishovite.
Found on
https://www.infoplease.com/dictionary/coesite
No exact match found.