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These calcite points from Bearmouth, Montana, exhibit growth phases similar to the growth rings in a tree. Each phase is represented by chevron shaped lines in the crystal. Calcite is typically white or clear in color, and the red in these is hematite (a.k.a., iron oxide or rust). Also, when knocked just right, these points will cleave on the chevron shaped lines, revealing one of the points of a previous growth phase.
They're available in three sizes. Specify which size you like, and we'll choose the most interesting one we have in that size.