Banded Chert / Sandstone Pebble
Microcrystalline Quartz (SiO2) / Silicified Sandstone
sedimentary
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
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Chert (Jasper-rich)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
Banded gneiss
Gneiss; chiefly quartz, feldspar, and mica
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Vesicular Basalt (Iron-rich)
Scoriaceous Basalt / Oxidized Vesicular Basalt
igneous
Variscite (or potentially a turquoise/variscite matrix cabochon, or an impression jasper)
AlPO4·2H2O (Variscite) or related phosphate/silicate material depending on exact composition
Mineral
Quartz-rich metamorphic rock (likely mica schist or gneiss)
Quartz–feldspar–mica assemblage; probable biotite schist/gneiss
metamorphic
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Sandstone
Arenite
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Tumbled basalt
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase, pyroxene, and commonly olivine
igneous
Weathered iron-rich rock, possibly laterite or limonite-bearing stone
Hydrated iron oxides/hydroxides, chiefly limonite-goethite mixture; exact identification requires testing
mineral
Red Sandstone
Arenite (primarily SiO2 with hematite/iron oxide coating)
sedimentary
Yellow quartz, possibly citrine
Quartz (SiO₂), yellow variety likely citrine; may also be iron-stained quartz
mineral
Diorite
Phaneritic intermediate plutonic rock
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Tumbled ocean jasper or orbicular jasper
Microcrystalline quartz (SiO₂), commonly with chalcedony, feldspar, and iron-oxide inclusions
mineral
Travertine (Tufa)
Chemical Sedimentary Rock / Travertine (CaCO3)
sedimentary
Smelter Slag
Anthropogenic Silicate Slag
igneous
Likely diamond accent
Diamond (crystalline carbon, C)
gemstone
Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix
metamorphic
Ferruginous Sandstone
Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)
sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Asphalt (Bituminous Concrete)
Asphaltum / Bitumen-Aggregate Matrix
Technonatural composite (often containing sedimentary/igneous aggregate)
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Chert (Iron-stained)
Silicon Dioxide (SiO2) with Ferruginous impurities
sedimentary
Pink Granite / Potassium Feldspar with Quartz
Granite (composed mainly of Orthoclase KAlSi3O8 and Quartz SiO2)
igneous
Limestone with Calcite
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Pink Granite
Granite (Felsic intrusive igneous rock)
igneous
Rounded yellow-brown pebble
Likely iron-stained sandstone or quartz-rich river cobble
sedimentary
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (SiO2 + varied clasts)
sedimentary