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Two distinct types of scepter crystals have been recovered, suggesting that two mechanisms of formation have been involved.
First, those scepter crystals in which the stem and crown are one continuous piece of quartz--as for all of the crystals in Figures 3 through 7--have possibly all developed by co-crystallization of quartz and calcite; the calcite having restricted the growth of the quartz laterally (see Fig.
A few clusters of small milky quartz crystals with amethyst scepter overgrowths have been recovered which, it is suggested, developed by a second mechanism--point nucleation.