Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
mineral
Category
Sedimentary (Secondary Mineral Formation)
Browse sedimentary (secondary mineral formation) specimens identified by the Rock Identifier community.
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Sulfur (on Matrix)
Native Sulfur (S8)
mineral
Shale
Fissile Mudstone
sedimentary
Pink Granite
Phaneritic Plutonic Felsic Rock (K-feldspar rich)
igneous
Orange Quartzite (Tumbled)
Quartzite (primarily SiO2 with trace Iron Oxide)
metamorphic
Quartzite (Potentially Ferruginous)
Quartzite (SiO2)
metamorphic
Milky Quartz (Common Quartz/Crystalline Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Dendritic Agate or Manganese Nodule in Chert/Limestone
Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions
sedimentary
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
sedimentary
Geode (Unopened)
Silica-rich concretion (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
River Pebbles (Stream-rounded rocks)
Fluvial Detritus (varied mineralogy)
Mixed (predominantly sedimentary and igneous)
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Dark-colored Igneous Rock (likely Basalt or Diabase)
Basalt (extrusive igneous) or Diabase (intrusive igneous)
Igneous Rock
Red Quartzite (Tumbled Pebble)
Quartzite (primarily SiO2 with hematite inclusions)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Pink Granite
Granite (Phaneritic Felsic Igneous Rock)
igneous
Sandstone Concretion (Omar or Nut Rock)
Sedimentary Concretion (specifically an 'Omarolluk' or Omar)
sedimentary
Shale
Shale
sedimentary
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Scoria (Volcanic Rock)
Scoria (often basaltic scoria)
Igneous
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pink Banded Agate (Dyed)
Chalcedony (cryptocrystalline silica), chemical formula SiO2
mineral
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Quartzite (Pink/Red variety)
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Lapis Lazuli
Lapis Lazuli (Complex aggregate of Lazurite, Calcite, and Pyrite)
metamorphic
Granodiorite (Gneissic texture)
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Red Quartzite
Quartzite (primarily SiO2 with hematite inclusions)
metamorphic
Quartzite with Hematite staining
Quartzite (SiO2) with iron oxide inclusions (Fe2O3)
metamorphic
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic