Calcita
Calcita is a mineral with formula CaCO₃, in the Carbonatos group. This specimen comes from España and joined the Terrium collection in 1995.
Description
Rhombohedron of translucent calcite with extraordinary phosphorescence. Sparry habit, with perfect cleavage and well-defined faces. It shows green fluorescence under long- and short-wave UV, and a uniform green phosphorescence that persists for 5 to 10 seconds after the light is turned off. No matrix.
History of this specimen
The one Óscar had in his collection, which is very phosphorescent.
About Calcita
Such marked green-yellow phosphorescence is usually due to uranium traces in the crystal structure. It does not register on a Geiger counter.
Technical data
- Catalogue No.
- 0228
- Composition
- CaCO₃
- Name
- Calcita
- Group
- Carbonatos
- Category
- Lucimera
- Country
- España
- Acquired
- 1995
- Ex-collection
- Oscar Herranz
- Etymology
- From the Latin «calx» («lime»), in allusion to its composition.
- Quality
- Buena
- Value trend
- Estable
Related specimens
- Abellaíta — España
- Abernathyita — España
- Abernathyita — España
- Abernathyita — España
- Aerenita — España
- Aerinita (fibrosa) — España
- Analcima — España
- Analcima — España