Basalt
Basalt (Mafic volcanic rock)
igneous
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
Learn about Industrial Byproduct (Anthropogenic Rock Like Material) in the encyclopedia
View all →
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Sandstone
Arenite (SiO2 based with quartz grains)
sedimentary
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Red Sandstone
Arenite (Iron-rich Sandstone)
sedimentary
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Chert (specifically Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentine
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Red Sandstone
Arenite (Fe2O3 rich)
sedimentary
Green Sea Glass
Man-made vitreous material (silica glass)
gemstone
Siltstone or Fine-grained Sandstone pebble
Siltstone (primarily SiO2 with clay minerals)
sedimentary
Small dark mineral/rock fragment
Indeterminate; possibly magnetite-bearing basalt or iron-rich slag
mineral
Polished orbicular jasper
Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions
sedimentary
Chert (and Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary
Clear Quartz / Diamond (untested)
Silicon Dioxide (SiO2) or Carbon (C)
mineral
Red Sandstone
Clastic Sedimentary Rock (typically contains Quartz and Iron Oxide)
sedimentary
Quartzite
Quartzite (principally SiO2)
metamorphic
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (often called Flint or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Coal
Combustible sedimentary rock
sedimentary
Red Sandstone
Arenite (with Iron Oxide / Hematite), Formula: SiO2 (Quartz) + Fe2O3 (Hematite coating)
sedimentary
Polymer Clay (Mock Mineral)
Polyvinyl chloride (PVC) with plasticizers and pigment
Synthetic material (Not a natural rock/mineral)
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Basalt
Basalt (Ma-Fe Silicate)
igneous
Diamond (or diamond simulant)
C
gemstone
Sulfur
Native Sulfur (S)
mineral
Sulfur (with Matrix)
Native Sulfur (S8)
mineral
Diamond (Cut Specimen)
Diamond (pure carbon, C)
mineral
Porphyritic Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Fossilized oyster or bivalve shell
Fossil Gryphaeidae or Ostreoidea; calcitic shell, CaCO₃
fossil
Chert (specifically Flint or Gray Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary