Quartz belongs to the trigonal clear system. The ideal clear appearance is a six-sided prism absolute with six-sided pyramids at anniversary end. In attributes quartz crystals are generally twinned, distorted, or so intergrown with adjoining crystals of quartz or added minerals as to alone appearance allotment of this shape, or to abridgement accessible clear faces altogether and arise massive. Well-formed crystals about anatomy in a 'bed' that has airy advance into a void, but because the crystals charge be absorbed at the added end to a matrix, alone one abortion pyramid is present. There are exceptions as doubly concluded crystals do occur. An accident in Herkimer County, New York is acclaimed for these Herkimer chunk with terminations at both ends. A quartz geode is such a bearings area the abandoned is about all-around in shape, lined with a bed of crystals pointing inward.
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