Tyuyamunita
Tyuyamunita is a mineral with formula Ca(UO₂)₂(VO₄)₂·5-8H₂O, in the Vanadatos group. This specimen comes from Rivas, Rivas Vaciamadrid, Madrid, España and joined the Terrium collection in 2025.
Description
Fluorescent yellow tyuyamunite crust on sepiolite matrix with pyrolusite stains.
About Tyuyamunita
Calcium uranyl vanadate of the autunite group, in which V substitutes for P. It is a rapidly forming supergene mineral capable of crystallising in oxidation zones and mine dumps within just a few decades.
About the locality
This recent find from the Sierra de Madrid stands as one of Spain's finest tyuyamunite deposits. Collectors rarely encounter Spanish specimens of this exceptional quality.
Technical data
- Catalogue No.
- 0644
- Composition
- Ca(UO₂)₂(VO₄)₂·5-8H₂O
- Name
- Tyuyamunita
- Group
- Vanadatos
- Category
- Núcleus Ardens
- Matrix
- Sepiolita
- Associations
- pirolusita
- Mine
- Rivas
- District / Municipality
- Rivas Vaciamadrid
- Province
- Madrid
- Country
- España
- Size (cm)
- 4.7 x 3.2 x 3
- Weight
- 25.5 g
- Acquired
- 2025
- Etymology
- Named after the Tyuya-Muyun district, Kyrgyzstan, where it was first described in 1912.
- Quality
- Buena
- Value trend
- Estable
Related specimens
- Abellaíta — España
- Abernathyita — España
- Abernathyita — España
- Abernathyita — España
- Aerenita — España
- Aerinita (fibrosa) — España
- Analcima — España
- Analcima — España