Antigorita (serpentinita)
Antigorita (serpentinita) is a mineral with formula (Mg,Fe)3Si2O5(OH)4, in the Filosilicatos group. This specimen comes from Pedreira, Serra da Colada, A Coruña, Galicia, España and joined the Terrium collection in 2025.
Description
Flattened, translucent plate of serpentinite with laminar habit and irregular fracture. Greyish-green with yellowish tones, showing the typical tile- or slab-like texture characteristic of the serpentinites of Cabo Ortegal.
History of this specimen
Second collection at the same spot I marked with Óscar in the Serra da Colada. It is one of the plates or 'tiles' we left marked for future visits.
About Antigorita (serpentinita)
Antigorite is the most stable variety in the serpentine series and is one of the principal minerals in serpentinites. It forms by hydration of olivine and pyroxene in mantle peridotites.
About the locality
Cabo Ortegal is a rare surface ophiolite exposure, where serpentinites show the transformation of ultramafic rocks in contact with hydrothermal fluids.
Technical data
- Catalogue No.
- 0270
- Internal reference
- T0005
- Composition
- (Mg,Fe)3Si2O5(OH)4
- Name
- Antigorita (serpentinita)
- Group
- Filosilicatos
- Mine
- Pedreira
- District / Municipality
- Serra da Colada
- Province
- A Coruña
- Region
- Galicia
- Country
- España
- Size (cm)
- 9 x 6 x 1.5
- Weight
- 60 g
- Acquired
- 2025
- Etymology
- The name derives from the locality of Antigorio (Piedmont, Italy), where it was first described.
- Quality
- Buena
- Value trend
- Estable
Related specimens
- Abellaíta — España
- Abernathyita — España
- Abernathyita — España
- Abernathyita — España
- Aerenita — España
- Aerinita (fibrosa) — España
- Analcima — España
- Analcima — España