Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
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Diamond
Native Carbon (C)
mineral
Serpentinite (or Green Quartz Pebble)
Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)
metamorphic
Serpentine / Antigorite
Mg3Si2O5(OH)4 (Serpentine Group)
metamorphic
Quartzite River Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C) or Zirconium dioxide (ZrO2) for CZ
gemstone
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Iron-rich vesicular rock, possibly slag or basalt
Uncertain; likely basaltic rock (plagioclase–pyroxene–iron oxide) or industrial iron slag
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Garnet (Rough Almandine Crystal)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Likely petrified wood or silicified fossil fragment
Silicified wood; predominantly microcrystalline quartz (SiO₂)
fossil
White Marble
Recrystallized Calcite (CaCO3) / Marble
metamorphic
Milky Quartz Nodule / Geode precursor
Silicon Dioxide (SiO2)
mineral
Sandstone with Dendritic Inclusions
Quartzose Sandstone
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Basalt (Glassy)
Basalt (Aphanitic-Glassy texture)
igneous
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Red Sandstone
Arenite (with Iron Oxide pigmentation)
Sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Vesicular Basalt
Aphanitic Mafic Volcanic Rock
igneous
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Sandstone
Sandstone (Sedimentary rock composed of silicate grains)
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Granitic Pegmatite
Granite (with coarse-grained Quartz, Feldspar, and Mica components)
igneous
Likely weathered quartz-bearing rock fragment
Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite
mineral
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
igneous
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Sandstone
Sandstone (Siliciclastic Sedimentary Rock)
sedimentary
Sandstone
Arenite (primarily Quartz and Feldspar)
sedimentary
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Basalt
Aphanitic Mafic Igneous Rock
igneous
Pumice
Pumicite / Vesicular Rhyolite
igneous
Sandstone
Arenite
sedimentary
Fossil Snail
Gastropoda (fossilized)
fossil
Schist
Mica Schist
metamorphic
Vesicular Basalt or Scoria
Basalt (extrusive volcanic rock)
igneous
River Pebble (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
igneous