Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz - SiO2)
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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Quartzite
Quartzite (primarily SiO2)
metamorphic
Likely quartz-rich river pebble
Milky quartz or quartz-bearing granitic/gneissic fragment (SiO₂-dominant)
igneous
Sandstone
Sandstone (various mineral compositions)
Sedimentary
Iron-stained garnet-bearing rock, possibly almandine garnet
Garnet-group silicate, likely almandine (Fe₃Al₂Si₃O₁₂), in a quartz–iron-oxide matrix
mineral
Vuggy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Druzy Quartz Geode (Partially Open)
Silicon Dioxide (SiO2) within Sedimentary Host Rock
sedimentary
Quartz-encrusted Matrix
Silicon Dioxide (SiO2) with Ferruginous Sandstone
sedimentary
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Quartzite with Hematite
Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 inclusions)
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite with Hematite cementation
sedimentary
Banded Iron Formation (BIF) / Banded Sandstone Nodule
Hematite-rich Sandstone / Ferruginous Chert
sedimentary
Crushed Stone / Gravel
Aggregatus saxum (variable mineral composition)
sedimentary
Basalt River Pebble
Basalt
igneous
Cubic Zirconia (Set in Jewelry)
Zirconium Dioxide (ZrO2)
gemstone
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Peridotite (Dunite/Lherzolite)
Ultramafic Peridotite
igneous
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Milky quartz with dark host-rock inclusions
Quartz (SiO₂), likely in a granitic or metamorphic matrix
mineral
Sandstone (specifically Arkose or Ferruginous Sandstone)
Sandstone (SiO2 with iron oxide inclusions)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Diamond (or Cubic Zirconia simulant)
C (Carbon) or ZrO2 (Zirconium Dioxide)
gemstone
Sodalite (blue beads) and Clear Quartz (clear beads)
Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2
mineral
Polished/tumbled brown jasper or iron-rich chert
Microcrystalline quartz (SiO₂), commonly colored by hematite/goethite
mineral
Polished dark chert or flint
Microcrystalline quartz (SiO₂), commonly called chert; possibly flint
sedimentary
Yellow chalcedony (likely lemon quartz or citrine)
Cryptocrystalline silica, SiO₂; possible quartz variety
mineral
Tumbled brown stone, likely jasper or iron-stained quartz
Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions
mineral
Fossil shell fragment
Likely a fossilized brachiopod or bivalve; exact taxon cannot be determined from the image
fossil
Polished copper-bearing mineral specimen, likely malachite-rich copper ore
Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Olivine (in Peridotite/Dunite form)
Magnesium Iron Silicate (Mg,Fe)2SiO4
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
gemstone
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Orange fire opal jewelry
Precious opal, hydrated amorphous silica (SiO₂·nH₂O)
gemstone
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Faceted Diamond / Moissanite / Cubic Zirconia
Carbon (C) if Diamond, Silicon Carbide (SiC) if Moissanite
gemstone