Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Category
Browse mineral, potentially a rock with chalcedony specimens identified by the Rock Identifier community.
Chalcedony or Chert/Jasper with secondary mineral staining
SiO2 (for chalcedony/quartz) with possible secondary copper minerals (e.g., CuSiO3·nH2O for chrysocolla, Cu2(CO3)(OH)2 for malachite) or iron oxides/hydroxides.
Agate (specifically Waterline or Onyx-type Agate)
Silicon Dioxide (SiO2) - variety Chalcedony
Geode (unopened) or Calcareous Nodule
Siliceous or Calcareous Concretion/Nodule
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
Unknown Rock Specimen
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
Turritella Agate (Elimia Agate)
Silicified Elimia tenera (formerly misidentified as Turritella)
Gold-bearing Quartz with Iron Oxides
Quartz (SiO2) with Limonite/Goethite (FeO(OH)) and Pyrite (FeS2)
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
Sandstone
Arenite (SiO2 based)
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Quartz Pebble
Silicon Dioxide (SiO2)
Green Jasper
Silicon Dioxide (SiO2)
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
Sandstone (with potentially high Feldspar/Arkose content)
Clastic sedimentary rock (SiO2 dominated)
Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
Raw Emerald in Schist Matrix
Beryl (Be3Al2Si6O18) in Mica Schist
Basalt (Weathered/River worn)
Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
Iron-stained Quartzite / Chert
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
Milky Quartz (Gold-bearing Prospecting Specimen)
Silicon Dioxide (SiO2)
Greywacke (River Slikenside)
Greywacke (Lithic Sandstone)
Sandstone
Arenite (primarily SiO2)
Rough Star Sapphire (Corundum)
Al2O3 (Aluminum Oxide)
Jasper
Agate/Jasper (Microcrystalline Quartz, SiO2)
Diorite (River Cobble)
Phaneritic Intermediate Igneous Rock
Weathered Sandstone with Algae Growth
Arenite
Clear Quartz Cluster
Silicon Dioxide (SiO2)
Magnetite (potentially as a Lodestone or within Ironstone)
Magnetite (Fe3O4)
Iron-stained Quartz (Gossan/Limonite-coated Quartz)
Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)
Basalt River Stone
Basalt (Aphanitic Mafic Volcanic Rock)
Basalt with Secondary Mineral Inclusions
Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
Greenstone (Amygdaloidal Basalt)
Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)