Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Not A Rock (Man Made Industrial Metal)
Browse not a rock (man made industrial metal) specimens identified by the Rock Identifier community.
Diamond in Kimberlite
Kimberlite Matrix with Carbon (Diamond)
igneous
Anthracite Coal
Anthracite
metamorphic
Limonite (Yellow Ochre)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Sandstone (specifically Red Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Agate (Nodule/Chert)
Silicon Dioxide (SiO2)
sedimentary
Basalt (Vesicular/Scoriaceous)
Extrusive Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)
Igneous
Ferruginous Sandstone
Arenite with Hematite/Limonite cement
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Calcite
Calcite (CaCO3)
Mineral
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
Igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
sedimentary
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Granite
Course-grained intrusive igneous rock
igneous
Red Sandstone
Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)
sedimentary
Rose Quartz (likely carved)
Rose Quartz (SiO2)
Mineral
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous
Scoria (Volcanic Rock)
Scoria (often basaltic scoria)
Igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Anthracite Coal
Anthracite
metamorphic
Anthracite Coal
Anthracite (Metamorphosed Coal)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Kyanite (within Quartz)
Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)
metamorphic
Agate (Bead Form)
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
White Quartz
Quartz (SiO2)
Mineral
Tufa (Vesicular Limestone)
Tufa (form of Calcium Carbonate, CaCO3)
sedimentary
Basalt (Vesicular or Porphyritic)
Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine)
igneous
Coral Fossil (Petrified Coral)
Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)
sedimentary
Chert (specifically Flint)
Microcrystalline quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Extrusive Mafic Igneous Rock
igneous