Yeso Sericolita
Yeso is a mineral with formula CaSO₄·2H₂O, in the Sulfatos group. This specimen comes from Qinglong Mine, Dachan, Qinglong County, Guizhou, China and joined the Terrium collection in 2025.
Description
Half Moon. Curved fibrous aggregate, translucent and colourless, forming an arc. Under UV light, numerous scattered green specks appear (uranates that grew in the matrix).
About Yeso
The intense green fluorescence under UV light is due to uranyl (UO₂²⁺), which in Qinglong gypsum occurs in two ways: uranium present at the ionic level within the gypsum crystal structure; and microcrystals of secondary uranium minerals such as tyuyamunite, metazeunerite, boltwoodite and sklodowskite.
About the locality
At this locality, curved "Ram’s Horn Gypsum" has been found, a habit associated with very specific conditions of low temperature and slow precipitation. These are uncommon, very rare when they show such transparency, and exceptional when they contain uranyl traces responsible for their characteristic fluorescence.
Technical data
- Catalogue No.
- 0325
- Composition
- CaSO₄·2H₂O
- Name
- Yeso
- Variety
- Sericolita
- Group
- Sulfatos
- Category
- Lucimera
- Associations
- uranatos indeterminados
- Mine
- Qinglong Mine
- District / Municipality
- Dachan
- Province
- Qinglong County
- Region
- Guizhou
- Country
- China
- Size (cm)
- 7 x 2 x 0.8
- Weight
- 18.4 g
- Acquired
- 2025
- Etymology
- From the Greek "gypsos", gypsum or plaster, for its use as a material for plastering and moulding.
- Quality
- Muy buena
- Value trend
- Estable
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