“3.8 x 3.1 x 2.9 cm. A very rare, outstanding and striking calcite specimen from the Arbuckle Mountains of Oklahoma. The artistic cluster of glassy, transparent calcite rhombs has striking phantoms formed by a rich speckling of variably-colored brown hematite spheres. The impressive, well-placed, large rhomb at the crest is 2.6 cm on the diagonal and has a stunning phantom. Ex. Allen Graffham Collection. ”