Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Category
Man Made (Synthetic Rock)
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
Biotite Schist
Biotite Schist
Metamorphic
Clear Quartz Crystal (Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
sedimentary
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Gold
Aurum (Au)
Mineral (Metal)
Crazy Lace Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Chert (Yellow Jasper/Quartzite Pebble)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
River Rocks (Basalt and Sedimentary Stones)
Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock
igneous and sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Sandstone
Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)
Sedimentary
Quartzite (Water-worn Cobble)
Quartzite (Composition: 90%+ SiO2)
metamorphic
Gneiss
Foliated Metamorphic Rock (Gneiss)
metamorphic
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Granite
Felsic Intrusive Igneous Rock
igneous
River Rock (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Shale or Siltstone
Sedimentary Rock (Siliciclastic)
sedimentary
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Limestone (specifically Dolomitic/Crystalline Limestone)
Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)
sedimentary
Basalt (Vesicular)
Mafic Volcanic Rock (rich in Magnesium and Iron)
Igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Conglomerate
Polymictic Conglomerate
sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz crystals
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Gneiss
Gneissic Metamorphic Rock
metamorphic
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
sedimentary
Serpentinite
Serpentinite ((Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Granite
Granite (Felsic Plutonic Rock)
igneous
Peridotite (Olivine/Peridot)
Peridotite: (Mg,Fe)2SiO4 (Olivine-rich ultramafic rock)
igneous
Basalt
Basalt (dominated by plagioclase feldspar and pyroxene)
igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Sandstone (Greywacke)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Pyrite in Shale
Iron Sulfide (FeS2)
mineral
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous