State by State
- Specimen Number
Block of barite (barium sulfate) breccia (angular broken rock), consisting of fragments of arkosic redbed sandstone with fracture porosity filled by quartz and barite. Conjugate fractures aligned both parallel to the base of the specimen, and rising to left. Portions are mineralized, indicated by blue (malachite?) and heavily oxidized fracture (lower left).
Host Rock: Sedimentary. Sandstone. Arkose. Fracture Filling: Hydrothermal. Vein.
- Location & Occurrence
Triassic red sandstone of the New Haven Formation of the Newark Supergroup was fault-fractured into a breccia during peak rifting, mainly along high-angle normal faults. The fracture porosity filled with hydrothermal veins precipitated by aqueous magmatic fluids, mainly quartz and barite. Likely from the Jinny Hill mines in Cheshire, CT, where barite ore was mined in the 19th century.
- Geologic Age
~200 million years old (Ma)
Symbolizes the dynamism of crustal rifting and volcanism near the time of the one of Earth's major extinction during the time of early dinosaurs as Pangea was being rifted apart.
Hartford Courant article says specimen came from deep in the Jinny Hill mine.
Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming