Gary Hansen self-collected these unusual specimens in South Dakota in the 60s - very sculptural and beautiful floater clusters of calcite crystals, delicately intergrown, included by grains of sand so that they look almost like stone sculptures! This one is out of the collection of noted California collector Charles Hansen (no relation).
== {{int:filedesc}} ==
{{Information
|Description=
{{en|1=Calcite
:: Locality: Rattlesnake Butte, Jackson County, South Dakota, USA ([http://www.mindat.org/loc-11576.html Locality at mindat.org])
:: Size: 6.9