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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.
All quartz is not the same - there are differences that do affect cristobalite generation - the ground quartz does produce more cristobalite.
Atoms of aluminum and sodium in the structure may help the stability of cristobalite as well.
The conversion of feldspar to cristobalite involves the removal of water.
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