Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Quartzite
Quartzite (SiO2)
metamorphic
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Basalt
Aphanitic Mafic Igneous Rock
igneous
Chert (Iron-stained)
Chert (SiO2 - Silicon Dioxide)
sedimentary
Crushed Limestone and Calcite
Calcium Carbonate (CaCO3)
sedimentary
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Basalt (Stream-worn Cobble)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Sandstone (Quartzose)
Arenite (SiO2 based)
sedimentary
Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Tiffany Stone
Fluoritized Opal Beryllium Ore (principally Bertrandite, Be4Si2O7(OH)2)
metamorphic
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Slag (Industrial Glass/Metal Waste)
Artificial silicate/ferro-silicate byproduct
Mineraloid (Industrial byproduct)
Schorl (Black Tourmaline) in Quartz/Feldspar Matrix
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Basalt River Pebble
Basalt
igneous
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Chert (specifically Gray/Black Chert)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite with Mafic Intrusion (Gneiss/Schist Contact)
Metamorphic Quartzite (SiO2) with Amphibole/Biotite Schist
metamorphic
Basalt
Basalt (dominated by Plagioclase Feldspar and Pyroxene)
igneous
White Quartz (Milky Quartz Mushroom)
Silicon Dioxide (SiO2)
mineral
Siltstone with Iron Staining
Siltstone (primarily SiO2 with Fe2O3 staining)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Magnetite (potentially Hematite-rich)
Magnetite (Fe3O4)
mineral
Chalcedony with inclusions (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Strawberry Quartz
Quartz with Hematite or Goethite inclusions (SiO2 + inclusions)
mineral
Sandstone
Arenite
sedimentary
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Basalt (River-worn Specimen)
Extrusive Mafic Igneous Rock
igneous
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Quartzite (Milky Quartz pebble)
Silicon Dioxide (SiO2)
metamorphic
Sandstone with Bedding Planes
Arenite (Sedimentary rock composed primarily of sand-sized minerals)
sedimentary
Citrine Quartz
Crystalline Silicon Dioxide (SiO2) with iron impurities
mineral
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral