Gneiss
Gneiss
Category
Browse mineral side rock specimens identified by the Rock Identifier community.
Gneiss
Gneiss
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
Sandstone
Arenite (Siliclastic sedimentary rock)
Granite
Granite
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Amygdaloidal Basalt with Agate/Chalcedony Infills
Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
Limestone Breccia
Sedimentary Breccia (Calcareous)
Sandstone
Arenite (primarily SiO2)
Quartz Geode
Crystalline Silicon Dioxide (SiO2)
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed mostly of SiO2)
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
Sandstone (Quartz-rich)
Clastic sedimentary rock (SiO2 primary)
Red Sandstone
Arenite (primarily Quartz SiO₂ with Hematite Fe₂O₃ staining)
Sandstone
Arenite
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone (Quartz Arenite)
Sandstone (SiO2 with possible mineral cements)
Sandstone
Arenite (SiO2 primarily)
Sandstone
Arenite
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Sandstone (Quartzose Pebble)
Clastic Sedimentary Rock (Litharenite/Quartz arenite)
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (Lithic Sandstone)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (primarily Quartz Arenite)
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Gneiss
Foliated Metamorphic Rock
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
Ferruginous Sandstone
Sandstone (rich in iron oxides/hydroxides)
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
Sandstone
Arenite (primarily SiO2)
Sandstone Concretion
Sedimentary concretion
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
Vesicular Basalt (or Porphyritic Scoria)
Vesicular Basalt
Sandstone (with potentially metamorphic or basaltic bands)
Arenite / Lithic Wacke
Sandstone with Quartz Vein
Arenite with Quartz (SiO2) Infilling