Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Not A Rock (Synthetic Material)
Browse not a rock (synthetic material) specimens identified by the Rock Identifier community.
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White pebble, likely quartz or calcite
Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)
mineral
Clear Quartz / Diamond (untested)
Silicon Dioxide (SiO2) or Carbon (C)
mineral
Granodiorite
Granodiorite
igneous
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodules (with Quartz Inclusions)
Microcrystalline Quartz (SiO2)
sedimentary
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Fulgurite
Lechatelierite (vitreous silica)
mineral
Pumice
Pumice (Vesicular volcanic glass / Rhyolite or Trachyte)
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Basalt with pale mineral veins/coating
Likely vesicular or altered basalt, with calcite or zeolite minerals
igneous
Tumbled yellow jasper (probable)
Jasper, an opaque microcrystalline variety of quartz; chiefly SiO₂ with iron-oxide inclusions
mineral
Tumbled white stone beads, likely marble or quartz
Undetermined; possibly marble (recrystallized calcite, CaCO₃) or milky quartz (SiO₂)
metamorphic
Chert
Chert (Microcrystalline Silica, SiO2)
sedimentary
Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based sedimentary rock)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Quartz-rich stone, possibly aventurine quartz or quartzite
Quartz (SiO₂), likely massive or microcrystalline; exact identification requires testing
mineral
Greenstone pebble (likely altered basalt or serpentine)
Greenschist-facies mafic rock; commonly chlorite–actinolite–epidote ± serpentine
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Raw amethyst quartz
Amethyst, purple variety of quartz (SiO₂)
mineral
Red Sandstone
Arenite (primarily Quartz with Iron Oxide)
sedimentary
Limestone
Calcite (CaCO3)
sedimentary
Dark green metamorphic rock, likely serpentinite
Serpentinite, chiefly serpentine-group minerals (antigorite/lizardite/chrysotile), commonly with magnetite and chromite
metamorphic
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Basalt (Crushed Stone Aggregate)
Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Sandstone (Arenite)
sedimentary
Quartzite (River Cobble)
Metamorphic Quartz-rich Rock
metamorphic
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Black Obsidian
Volcanic Glass (SiO2 with impurities)
igneous
Sandstone
Arenite
sedimentary