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Analyses of some samples of the dense grey rimstone sinter showed weak reflections, indicating the possible presence of cristobalite .
Look up cristobalite in the textbook and describe a likely environment for the formation of this sample.
Atoms of aluminum and sodium in the structure may help the stability of cristobalite as well.
All quartz is not the same - there are differences that do affect cristobalite generation - the ground quartz does produce more cristobalite.
The conversion of feldspar to cristobalite involves the removal of water.
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