Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
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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Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Pumice
Pumice (Amorphous volcanic glass)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 with various trace minerals)
sedimentary
Weathered, iron-stained quartz-rich pebble (uncertain identification)
Microcrystalline quartz, SiO₂, with iron-oxide/hydroxide staining and dark matrix inclusions
mineral
Coal (Anthracite/Bituminous)
Carbo fossilium (primarily Carbon)
sedimentary
Diamond
Diamond (pure carbon; C)
Mineral
Sandstone
Arenite (SiO2 dominant)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz and Feldspar composition)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Possible iron-rich basalt or industrial slag
Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Marble
Metamorphosed Limestone (CaCO3)
metamorphic
Sandstone
Arenicola (comprising mostly Quartz, SiO2)
sedimentary
Sandstone (Banded)
Arenite (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Porphyritic Rhyolite (Birdseye Rhyolite)
Rhyolite (Porphyritic texture)
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Sandstone
Arenite (typically with iron oxide/hematite cement)
sedimentary
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt containing Zeolite or Quartz (SiO2/Silicates)
igneous
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chert (Chert / Flint)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz geode or drusy quartz cluster
Quartz (silicon dioxide, SiO₂), likely microcrystalline quartz lining a cavity
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary