Bridalveil Falls, Spearfish Canyon, Lawrence Co., South Dakota, USAQuartz, calcite, fluorite in geodes below limestone on west side of canyon.
Phonolite sill outcrops on both sides of canyon a short distance north of the geode locality and contains barite, analcime, aegrine, apatite, calcite, and probably others.
8 entries listed. 6 valid minerals.
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