Limestone
Calcium Carbonate (CaCO3)
sedimentary
Category
Sedimentary (Processed Mineral Product)
Browse sedimentary (processed mineral product) specimens identified by the Rock Identifier community.
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Chert (specifically Flint or Nodular Chert)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pumice or vesicular volcanic rock
Pumice; predominantly volcanic glass (silica-rich, commonly rhyolitic to dacitic)
igneous
Hematite
Hematite (Fe2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Limonite (Iron Ore/Hydrated Iron Oxide)
Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))
Mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Shale
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Limestone (likely weathered or plaster-coated)
Calcite-rich carbonate rock; primarily CaCO₃
sedimentary
Celestite (Blue Celestine)
Celestine (Strontium Sulfate, SrSO4)
mineral
Basalt pebble
Fine- to medium-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine and iron oxides
igneous
Fossil Shark Tooth
Chondrichthyes (tooth)
fossil
Sea Glass
Man-made silicate glass (Amorphous silicon dioxide)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Blue gemstone ring, likely blue topaz or synthetic blue spinel
Likely topaz (Al₂SiO₄(F,OH)₂) or synthetic spinel (MgAl₂O₄); identification is uncertain from the image
gemstone
Hematite
Iron(III) oxide (Fe2O3)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Dark pebble with pale mineral patches
Likely porphyritic basalt or andesite; identification is uncertain from the photograph
igneous
Clear quartz crystal (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Graphite
Graphite (Carbon, C)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Coprolite
Fossilized Feces
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Small weathered mineral/rock fragment
Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Likely weathered basalt
Basalt; fine-grained mafic rock composed mainly of plagioclase, pyroxene, and commonly olivine or iron oxides
igneous
Milky quartz / quartz-rich vein rock
Quartz, silicon dioxide (SiO₂), likely massive quartz with minor iron-staining or feldspar
mineral
Fossilized Gastropod Shell
Gastropoda (calcium carbonate / aragonite)
fossil
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Mixed Rock Collection (Pebbles and Stones)
Various geological specimens
igneous, sedimentary, and metamorphic
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Chakra Stone Tower (Composite Multi-Mineral)
Crystalline Silicon Dioxide composite (SiO2) with various inclusions
mineral
Iron Slag
Anthropogenic pyrometallurgical byproduct
igneous
Mineral Specimens and Streak Test
Various Minerals (Silicates, Carbonates, Oxides)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral