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Although the optical, SEM, and XRD data are consistent with quartz, considering the incongruous crystal symmetry, it is likely that this mineral is actually a quartz pseudomorph after tridymite .
The abundant and ubiquitous quartz paramorphs after tridymite in the walls attest to a very shallow emplacement depth.
Because there is a significant difference in crystal structure among the three forms, cooling tridymite or crystoballite below 572°F results in metastable forms that retain the high temperature structure.
Quartz paramorphs after tridymite are absent from Fiachanis but present in the three Priomh-lochs samples adjacent to late minor intrusions.
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