has orange-brown streak and is vitreous

Shape: Oval Cabochon

2 grams and measuring 72x66x10mm

This deep color is no longer being produced from this locality

in addition to their funky

Calcite on Calcite on Matrix | Crystal Cluster 55.52g | Oskaloosa, Mahaska County, Iowa, USA | SO24 NWA 250 has orange-brown streak and isThis 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.