Sandstone
Quartzose Sandstone (Sedimentary Rock)
sedimentary
Category
Not A Rock Or Mineral (Anthropogenic Material)
Browse not a rock or mineral (anthropogenic material) specimens identified by the Rock Identifier community.
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Banded gneiss pebble
Biotite–quartz–feldspar gneiss (composition variable)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Quartz / Common Agate
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Fossil Snail
Gastropoda (fossilized)
fossil
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Gravel / Limestone Fragment
Calcium Carbonate (CaCO3) / Fine-grained Sedimentary Rock
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Raw Agate (Rough Lake Superior Agate or Jasper-Chalcedony Nodule)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Likely weathered quartz-rich stone or fossil fragment
Indeterminate; possibly quartz-bearing sandstone, iron-stained quartz, or a fragmentary fossil
mineral
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Sandstone
Sedimentary Rock (Quartz/Feldspar grains cemented together)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Milky Quartz with Chlorite/Amphibite Inclusions
Silicon Dioxide (SiO2) with various mineral inclusions
mineral
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Nephrite Jade
Nephrite
Mineral/Rock
Greenstone (Epidosite)
Epidosite (Metamorphosed Basalt/Diabase)
metamorphic
Slag (Industrial Glass)
Anthropogenic Vitreous Slag (Post-industrial byproduct)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Weathered granite or granitic gneiss fragment
Granite, predominantly quartz, feldspar, and dark mica/amphibole
igneous
Limestone or Sandstone Cobble
Sedimentary rock (Calcium carbonate or Quartz based)
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Sandstone
Arenite (primarily Quartz-rich)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary