Sandstone (Water-worn pebble)
Arenite (primarily SiO2)
sedimentary
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Iron-stained Quartz (with Limonite/Hematite)
Silicon Dioxide (SiO2) with Iron Oxide inclusions (FeO(OH) or Fe2O3)
Mineral
Clear Quartz (Druzy)
Crystalline Silicon Dioxide (SiO2)
mineral
River Pebble (Gneiss/Schist mix)
Metamorphic rock aggregate
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Banded Agate (with possible Chalcedony layers)
Silicon dioxide (SiO2)
sedimentary
Red Jasper (possibly Brecciated)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper pebble
Jasper (Silicon Dioxide, SiO2)
sedimentary
Coal
Bituminous Coal (organic sedimentary rock)
sedimentary
Diamond
C (Carbon)
mineral
Diamond (or Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Green Aventurine (Quartz)
SiO2 (Silicon Dioxide with Fuchsite inclusions)
mineral
Almandine Garnet (Tumbled)
Fe3Al2(SiO4)3
mineral
Black Diamond / Black Sapphire
Carbon (C) or Corundum (Al2O3)
mineral
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Fossil bivalve shell
Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details
fossil
Raw Garnet (Hessonite / Spessartine)
Silicate mineral group (X3Y2(SiO4)3)
gemstone
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Diamond (in jewelry setting)
Diamond (C - Pure Carbon)
mineral
Quartz (Milky Quartz / Greenish Quartz)
SiO2 (Silicon Dioxide)
mineral
Parti Sapphire
Corundum (Al2O3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Concretionary Sandstone
Clastic Sedimentary Rock (Sandstone with secondary mineral cementation)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Ferruginous Slag (Iron Smelting Byproduct)
Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)
Antropogenic Glass / Mineraloid
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Quartzite
Quartzite (composed primarily of silica, SiO2)
metamorphic
Bituminous Coal
Coal (Organically derived sedimentary rock)
sedimentary
Anthracite Coal
Anthracite (Highly Metamorphosed Coal)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Bentonite Clay
Montmorillonite ((Na,Ca)0.33(Al,Mg)2Si4O10(OH)2·nH2O)
sedimentary
River Pebble (Gravel)
Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)
sedimentary
Slag Glass
Glassy Silicate Residue
industrial byproduct
Coal
Anthracite / Bituminous Coal
sedimentary