Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
The Purple Specimen Is A Mineral (Amethyst); The White Specimen Is A Sedimentary Rock (Limestone Or Marble).
Browse the purple specimen is a mineral (amethyst); the white specimen is a sedimentary rock (limestone or marble). specimens identified by the Rock Identifier community.
Lapis Lazuli
Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) in a Geode body
sedimentary or igneous (host environment)
Quartz Geode (with Agate banding)
Silicon Dioxide (SiO2)
Sedimentary or Igneous (secondary formation)
Agate (Chalcedony)
Cryptocrystalline Silica or Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Coral Fossil (Favosites)
Favosites (Extinct genus of tabulate corals)
sedimentary
Green Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Amethyst
Amethyst (Silicon Dioxide SiO2 + Fe4+)
mineral
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone Cobble
Clastic Sedimentary (Sandstone)
sedimentary
Chert (and/or Flint)
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Dalmatian Stone (Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Amethyst (Variety of Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Sapphire (likely costume glass imitation)
Corundum (Al2O3) with iron/titanium impurities
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Sandstone (Quartzite Pebble)
Arenite (SiO2)
sedimentary
Weathered Sandstone with Algae Growth
Arenite
sedimentary
Sandstone Cobble
Arenite (Secondary classification based on grain size)
sedimentary
Yellow Chert or Jasper
Silicon Dioxide (SiO2)
sedimentary
Amethyst
Silicon Dioxide with trace inclusions of Iron (SiO2)
mineral
Fossiliferous Limestone
Calcareous biomicrite / Calcium Carbonate (CaCO3)
sedimentary
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Citrine Quartz Crystal Cluster
Silicon Dioxide (SiO2) with iron impurities
mineral
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz
sedimentary
Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Quartz Vein in Schist
Quartz (SiO2) in Mica Schist
metamorphic
Chalcedony (Botryoidal/Agate nodule)
Microcrystalline Quartz (SiO2)
mineral
Chert (Nodular Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary