Dims: 5.6 x 5.4 x 3.6" (14.2 x 13.7 x 9.1 cm)
Wt: 4 lbs., 8.0 oz. (2.042 kg)
unknown (likely Chihuahua, Mexico)
This large piece consists of a chunk of a semi-crystalline Calcite crust. It shows definite crystalline tendencies, but is also layered in areas, like marble. Its color ranges from a pale, creamy-yellow to rust-red to nearly colorless, and its uniform pearly luster was likely induced by "pickling" the piece in acid.