Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Category
Browse mineral on sedimentary specimens identified by the Rock Identifier community.
Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)
Chalcedony (SiO2), Jasper (SiO2 with impurities)
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.
SiO2 (Silicon Dioxide)
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Yellow Jasper
Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)
Petrified Wood
Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Calcite on Limestone
Calcium Carbonate (CaCO3) on Sedimentary Rock
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Calcite in Matrix
Calcium Carbonate (CaCO3) on Sedimentary Host Rock
Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
Weathered Sedimentary Rock
Sedimentary Rock
Banded gneiss
Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss
Sandstone (Picture Sandstone)
Arenite (primarily SiO2)
Sandstone
Clastic sedimentary rock (Quartz arenite or Arkose)
Tumbled jasper (likely picture/brecciated jasper)
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
Brown Sandstone (River Rock)
Arenite
Green Calcite
Calcium Carbonate (CaCO3)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
Quartz
Silicon dioxide (SiO2)
Sedimentary Sandstone
Arenite (Sedimentary Rock)
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
Sedimentary Sandstone with Iron Oxide
Ferruginous Sandstone
Banded Sedimentary Rock
Sedimentary Rock with Quartz/Feldspar Vein
Siltstone / Slate
Siltstone / Low-grade Slate
Pyrite
Iron Sulfide (FeS2)
Sandstone
Clastic Sedimentary Rock
Shale
Argillaceous sedimentary rock
Sedimentary Rock Fragments
Clastic Sedimentary Rock
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
Shale and Pebble Fragment
Sedimentary Rock (Mudstone/Shale with Silica Pebble)
Veined Sandstone with Calcite Veins
Sedimentary sandstone with hydrothermal/mineral veins
Limonite Geode (Ironstone Concretion)
Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior
Sandstone
Arenite (primarily SiO2)
Banded gneiss
Foliated gneiss, likely quartz–feldspar–mica gneiss
Banded gneiss
Quartz–feldspar gneiss, possibly biotite-bearing; exact identification requires testing
Banded gneiss
Gneiss, commonly quartz–feldspar–mica gneiss
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
Concretion
Sedimentary Concretion