Ametista do Sul
27.3608° S, 53.1819° W · ± 10 km
Amethyst from Rio Grande do Sul, Brazil, with photos of specimens from this locality.
Minerals found here
Amethyst at Ametista do Sul
Amethyst linings in geodes from Serra Geral flood basalt, where the geode sequence ends in amethystine quartz after calcite and agate stages
- Formula
- SiO₂
- Morphology
- Amethyst-lined geodes in basalt
- Color / luster
- Violet amethyst crystals
- Availability
- Commonly available
- History
- Cited in the literature as the largest amethyst-producing basalt flow in the world; the town is built around amethyst mining
Geology of the locality
- Setting
- Amethyst-bearing geodes in basalt flows of the Serra Geral Formation (Parana volcanic province)
- Host rock
- Basalt
- Region
- Rio Grande do Sul
- Country
- Brazil
Coordinates are the municipality position from Wikipedia, so only district-level. Several amethyst mines are reported as still active.
Sources
- SRC-102 · Database
Amethyst from Ametista do Sul, Rio Grande do Sul, Brazil (Mindat locality entry 280208)Mindat.org - SRC-103 · Article
Genesis of amethyst geodes in basaltic rocks of the Serra Geral Formation (Ametista do Sul, Rio Grande do Sul, Brazil)Gilg, H.A.; Morteani, G.; Kostitsyn, Y.; Preinfalk, C.; Gatter, I.; Strieder, A.J. · 2003 · Mineralium Deposita 38, 1009-1025 - SRC-109 · Website
Ametista do SulWikipedia
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.