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Mineral Specimen #4415    Calcite over Celestine (not acid washed)

Mojina Mine, Rancho de Mojina, Ricardo Flores Magon, Mun. de Buenaventura, Chihuahua, Mexico

Ex. A. Neely, 1960s

Intermixed white colored Calcite with blue colored Celestine. In the past, these specimens were labeled as being Aragonite as opposed to Calcite. In the late 1960s, Bennie Fenn and Susan Davis brought quite a large number of these specimens on the market. No more have been mined since that time. And although once plentiful, there are rarely seen today except when old collections are dispersed. The vast majority of the specimens were acid washed to better expose the Celestine, remove some of the tan color and give the Calcite luster. When this was done, the Calcite acquired rounded surfaces and was called Popcorn Calcite. This is a very rare example of this material which was never acid washed. The Calcite crystals come to sharp points and have no luster. Once, about 15 years ago, using one of the acid washed specimens, I etched away all of the Calcite with HCl. What was left was a lattice work of thin platy blue Celestine crystals. Although very attractive and interesting, the remaining Celestine was so thin and fragile that it broke apart as soon as it was moved. It is apparent, the Calcite formed on the Celestine as a secondary growth. Under SW UV, the Calcite exhibits a bright green color in places and a blue color in other places.

Condition: Very Good to Excellent

Flaws: Nothing Appreciable

6.2 x 4.6 x 3.3 cm

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This mineral is also found in the following galleries: Minerals From Mexico | Calcite | Sulfates | Minerals Priced Between 50 and 99 Dollars
This mineral is also found in the following galleries: Minerals From Mexico | Calcite | Sulfates | Minerals Priced Between 50 and 99 Dollars