Mineral, Potentially A Rock With Chalcedony

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)