Calcite on Calcite Crystal Cluster | 64g | Oskaloosa, Mahaska County, Iowa, USA Mesosiderite Origin: Ontario

Origin: Ontario

some forming pits as deep as 30 centimetres

promote balance and relaxation

Some workers have suggested that the rocks are frictionites (fused rocks from landslide heating)

Calcite on Calcite Crystal Cluster | 64g | Oskaloosa, Mahaska County, Iowa, USA Mesosiderite Origin: OntarioThis is a natural cluster formation of calcite on calcite crystals or two variations of the mineral found in a cracked concretion in a coal mine in Oskaloosa, Mahaska County, Iowa, USA. It is a specimen consisting of two types of calcite on matrix. The first type is a coating of iridescent, dark calcite on the matrix. The second type are white crystals of calcite. It is in good condition. Would be a nice addition to any new or existing collection.