Calcite      Irai, Rio Grande do Sul, Brazil.  Ex. Harold L. Dibble collection.  5.6 x 4 x 4 cm grouping of triangular profiled prismatic crystals of milky colored calcite to 3.5 cm each.  Edges show breakage from removal as would be expected but body of specimen is damage- free. Small block of Styrofoam glued to base so the piece stands upright.   $80