Yellow Jasper with Red Inclusion
Silicon Dioxide (SiO2) with Iron Oxides
sedimentary
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic Material (Not A Rock Or Mineral) in the encyclopedia
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Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Chert (Yellow or Ochre Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Quartzite River Cobble
Meta-quartzite (SiO2 with iron oxide staining)
metamorphic
Quartzite with Hematite staining
Metamorphic Quartzite (SiO2)
metamorphic
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Soft Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
K2 Azurite Granite / K2 Stone
Granite (igneous rock) with Azurite inclusions (mineral)
igneous
Chert Nodule (Flint)
Chert (Cryptocrystalline Silica - SiO2)
sedimentary
Sandstone pebble
Sandstone (arenite / quartzarenite)
sedimentary
Limestone (Fossiliferous)
Calcium Carbonate (CaCO3)
sedimentary
Chert (varietal Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Felsic intrusive igneous rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomeratic breccia
Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix
sedimentary
River Pebble
Siliceous rock fragment / Quartzite / Sandstone pebble
sedimentary
Tumbled pegmatitic granite
Coarse-grained granite/pegmatite, chiefly quartz, feldspar, and biotite or amphibole
igneous
Conglomerate (Puddingstone)
Conglomerate (specifically, clastic sedimentary rock)
Sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartzite with Iron Inclusions
Quartzite (SiO2 with Fe2O3 impurities)
metamorphic
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Quartz-bearing granite or gneiss fragment
Granite/gneiss composed mainly of quartz (SiO₂), feldspar, and minor mica or ferromagnesian minerals
igneous
Granite Pebble with Quartz/Feldspar Vein
Intrusive Felsic Igneous Rock (Granite)
igneous
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)
Weathered granite or granitic gneiss
Granite; predominantly quartz, feldspar, and mica, possibly altered to gneiss
igneous
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Chert (Jasper) Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Iron-rich quartzite or ironstone
Ferruginous quartzite; predominantly quartz (SiO₂) with hematite/goethite (Fe₂O₃/FeO(OH))
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Tumbled dark stone, likely basalt or basaltic pebble
Fine-grained mafic volcanic rock; commonly composed of plagioclase, pyroxene, and minor olivine (basalt)
igneous
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Chalk
Calcium carbonate (CaCO3)
sedimentary
Basalt
Basalt
igneous
Blue Tiger's Eye
Riebeckite (crocidolite variety)
Mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary