Yeso
Yeso is a mineral with formula CaSO₄·2H₂O, in the Sulfatos group. This specimen comes from Polkowice-Sieroszowice, East Camp, Polkowice, Baja Silesia, Polonia and joined the Terrium collection in 2025.
Description
Sculptural piece with a dominant elongated prismatic crystal, partly transparent, showing pronounced longitudinal striations and a subtle yellowish tone at the base. At the centre, a cluster of finer second-generation crystals forms a radiating spray.
About Yeso
Gypsum is a hydrated calcium sulphate, characterised by prismatic or acicular habit and low hardness. At Polkowice-Sieroszowice some of the finest European specimens have been found, noted for their complex growths and high transparency.
About the locality
The Polkowice-Sieroszowice mine is noted for gypsum crystals of exceptional quality associated with copper extraction. It forms part of the Lower Silesian mining belt and has produced reference specimens worldwide, especially for acicular and prismatic forms and radial aggregates.
Technical data
- Catalogue No.
- 0135
- Composition
- CaSO₄·2H₂O
- Name
- Yeso
- Group
- Sulfatos
- Category
- Estélites
- Mine
- Polkowice-Sieroszowice
- District / Municipality
- East Camp, Polkowice
- Province
- Baja Silesia
- Country
- Polonia
- Size (cm)
- 7.2 x 2.3 x 2.2
- Weight
- 12 g
- Acquired
- 2025
- Etymology
- From the Greek "gypsos" (gypsum), in allusion to the material used historically in construction and ornamentation.
- Quality
- Top
- Value trend
- Al alza
Related specimens
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- Barita — Perú
- Barita (Azul) — España