Sandstone Concretion
Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)
sedimentary
Category
Not A Rock
Browse not a rock specimens identified by the Rock Identifier community.
Unakite
Epidotized Granite
metamorphic
Chert (specifically Jasper)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
River Cobble (likely Basalt)
Mafic Igneous Rock (Aphanitic)
Igneous
Green Chalcedony (likely Green Agate or Chrysoprase)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Pumice (likely)
Pumice (extrusive igneous rock)
Igneous
Gneiss (High-grade Metamorphic Rock)
Gneiss (Metamorphic silicate rock)
metamorphic
Diorite
Phaneritic Intrusive Igneous Rock (Intermediate Composition)
igneous
Basalt (with possible mineral veining)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Basalt Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (River Pebble)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt (Porphyritic)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt (River Pebble)
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Basalt with Scoria
Mafic Volcanic Rock (Basalt/Scoria)
igneous
Porphyritic Andesite
Porphyritic intermediate volcanic rock (Andesite)
Igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Arkosic Sandstone (or Conglomeritic Sandstone fragment)
Arkose (rich in feldspar)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Ferruginous Sandstone
Ferruginous Clastic Sedimentary Rock
sedimentary
Sandstone (Ferruginous)
Sandstone (mainly SiO2 with Fe2O3 staining)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Granite
Phaneritic Acidic Igneous Rock (Granite Group)
igneous
Carnelian
Carnelian (SiO2)
mineral
Sandstone
Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)
sedimentary
Granite / Gneiss Complex
Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)
igneous/metamorphic
Sandstone
Arenite (SiO2 principal)
sedimentary
Limestone
Calcareous Sedimentary Rock (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Fossiliferous Limestone
Fossiliferous Calclutite / Bio-calcarenite (CaCO3)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within a metamorphic matrix
metamorphic
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary