Trept Quarry
45.6971° N, 5.3053° E · ± 1 km
Marcasite from Isere, France, with photos of specimens from this locality.
Minerals found here
Marcasite at Trept Quarry
Useful example of marcasite pseudomorphically replacing fossils in limestone
- Formula
- FeS₂
- Morphology
- Fossil replacements; thin bladed crystals
- Color / luster
- Pale metallic to tarnished
- Associated minerals
- Pyritelimestone fossilscelestine
- Surface features
- Preserves bivalve and other fossil forms
- Twins
- Repeated twins may occur in bladed growth
- Availability
- Scarce
- History
- Trept quarry near Montalieu is known for marcasitized fossil material
Sources: SRC-017
Geology of the locality
- Setting
- Sedimentary sulfide replacement in limestone
- Type
- Sedimentary
- Host rock
- Limestone
- Region
- Isere
- Country
- France
Near Montalieu; marcasite and pyrite replace bivalves and other fossils. Quarry and lime-works site at Trept (lieu-dit Duin et La Gagne); position from an industrial-site record.
Sources
- SRC-017 · Website
Marcasite encyclopediaLe Comptoir Geologique · Le Comptoir Geologique - SRC-026 · Website
Chaux et Ciment de St Hilaire, Trept (ICPE site record)2026
Draft data from the Provenite workbook. Check entries against the cited sources before relying on them. Photos are open-licence images from Wikimedia Commons; the author and licence are given with each photo.