Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
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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Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
metamorphic
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite with iron oxide (Hematite) cement
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
sedimentary
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Weathered brown mineralized rock
Likely iron-stained quartzite or quartz-rich metamorphic rock; exact identification requires testing
metamorphic
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Cubic Zirconia (Faceted Gemstone)
Zirconium dioxide (ZrO2)
gemstone
Metaconglomerate
Metaconglomerate (Quartzite conglomerate)
metamorphic
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Fossiliferous Limestone / Petrifaction
Sedimentary rock with fossil inclusions / Calcium Carbonate (CaCO3)
fossil
Ferruginous Sandstone (Gozzan)
Iron-rich clastic sedimentary rock with Limonite/Goethite
sedimentary
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Coprolite
Fossilized Feces
fossil
Red Jasper (Polished)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Possible flint or slag fragment
Microcrystalline quartz (chalcedony), or iron-rich industrial slag
mineral
Bivalve Fossil (Fossilized Shell)
Class Bivalvia (fossilized in Calcium Carbonate/Aragonite)
fossil
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Muscovite Mica
Muscovite / KAl2(AlSi3O10)(OH)2
mineral
Quartz (Rose or Milky)
Silicon Dioxide (SiO2)
mineral
Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt (comprising plagioclase feldspar and pyroxene group minerals)
igneous
Sandstone with Tafoni Weathering
Arenite (SiO2 based)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly weathered chert or chalcedony
mineral
Tumbled gray feldspar-rich stone, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, potentially fine-grained granite or quartzite
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Sandstone
Arenite (SiO2 based with Fe2O3)
sedimentary
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Schist
Lepidoblastic Mica Schist
metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or feldspar
metamorphic
Sandstone Pebble
Arenite
sedimentary
Red Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)
sedimentary
Likely dark green-gray metamorphic pebble
Indeterminate; possibly chlorite schist, serpentinite, or amphibolite
metamorphic
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral