Peridot (likely, based on color and appearance)
Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)
Mineral
Category
Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)
Browse sedimentary rock (specifically a concretion or possibly a geode) specimens identified by the Rock Identifier community.
Banded River Cobble with Mafic Dike
Hydrothermally altered Graywacke or Sandstone with Mafic Intrusion
igneous and sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Garnet Schist
Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)
metamorphic
River Rock (Greywacke/Siltstone)
Siltstone / Argillaceous Greywacke
sedimentary
Jasper (Iron-rich)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
sedimentary
Glauconitic Sandstone
Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Painted Pet Rock (Quartzite/Sandstone base)
Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments
sedimentary
Sandstone
Arenite
sedimentary
Chert (Yellow/Brown Jasper)
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Quartzose Sandstone Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Basalt (River Rock/Cobble)
Basalt (no specific mineral formula as it's a rock)
Igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Granite Cobble
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Chert (Jasper/Quartzite variety)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (and its variety Flint)
Silicon dioxide (SiO2) / Microcrystalline quartz
sedimentary
Chert (Jasper variety)
Cryptocrystalline quartz (SiO2)
sedimentary
Tree Agate
Dendritic Chalcedony (SiO2)
sedimentary
Chert (Flint nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Green variety)
Silicon Dioxide (SiO2)
sedimentary
Picture Jasper
Silicon dioxide (SiO2)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Herkimer Diamond (Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Black Jasper (Black Onyx substitute)
Silicon Dioxide (SiO2) with carbonaceous impurities
sedimentary (microcrystalline quartz)
Chert (Tan/Grey variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Quartzite
Quartzite (SiO2)
metamorphic