Dolomita
Dolomita is a mineral with formula CaMg(CO₃)₂, in the Carbonatos group. This specimen comes from Azkarate, Eugui, Esteríbar, Navarra, España and joined the Terrium collection in 1998.
Description
Small aerial cluster of rhombohedra with very well-defined penetration twins, clearly visible on all crystals. The piece shows good transparency, vitreous lustre, very sharp faces and edges, a contact area on the reverse, and a reaction under ultraviolet light.
History of this specimen
Collected directly by Txomin.
About Dolomita
With crystals up to 10 cm, the veins of this open-cast quarry have produced some of the—if not the—best dolomite specimens in the world, with transparent, twinned crystals.
About the locality
It is primarily an open-cast magnesite quarry. For mineral collectors it is a legendary locality.
Technical data
- Catalogue No.
- 0374
- Composition
- CaMg(CO₃)₂
- Name
- Dolomita
- Group
- Carbonatos
- Category
- Meritum Persé
- Mine
- Azkarate
- District / Municipality
- Eugui
- Province
- Esteríbar
- Region
- Navarra
- Country
- España
- Size (cm)
- 4 x 3 x 2.3
- Weight
- 23.8 g
- Acquired
- 1998
- Ex-collection
- Domingo Moreno (Txomín)
- Etymology
- Named for the French geologist Déodat Gratet de Dolomieu, who in 1791 described in the Alps a magnesium-rich limestone that did not effervesce with acid. Dolomieu served as the geologist on Napoleon's Egyptian expedition (1798); after illness, shipwreck and imprisonment, his health was ruined and he died a few months after his release.
- Quality
- Muy buena
- Value trend
- Estable
Related specimens
- Abellaíta — España
- Abernathyita — España
- Abernathyita — España
- Abernathyita — España
- Aerenita — España
- Aerinita (fibrosa) — España
- Analcima — España
- Analcima — España