Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
Category
Browse sedimentary (man made) specimens identified by the Rock Identifier community.
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3/FeO(OH) cement)
Sandstone (likely Greywacke variant)
Arenite
Likely weathered gray stone or chert fragment
Uncertain; possibly microcrystalline quartz (SiO₂)-rich chert
Sandstone
Clastic sedimentary rock (primarily SiO2)
Polished serpentine pendulum
Serpentine-group minerals, chiefly antigorite/lizardite; approximate formula Mg₃Si₂O₅(OH)₄
Vesicular basalt (likely weathered lava rock)
Vesicular basalt; primarily plagioclase feldspar, pyroxene, and volcanic glass, with possible iron-oxide alteration
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains, primarily SiO2)
Diamond
Carbon (C)
Sandstone
Arenite (composed mainly of SiO2)
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
Turquoise (beads)
Turquoise; CuAl6(PO4)4(OH)8·4H2O
Pyrite
Pyrite (Iron Disulfide), FeS2
Rough Diamond
Diamond (Pure Carbon: C)
Chert (Flint) with Limestone Matrix
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Quartzite
Quartzite (SiO2)
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Sandstone
Arenite (primarily SiO2)
Sandstone with Iron Staining
Arenite (SiO2 with FeO(OH) impurities)
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Limestone (specifically a Crushed Aggregate fragment)
Calcium Carbonate (CaCO3)
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite (SiO2 primarily)
Sandstone
Arenite (primarily SiO2)
Red Sandstone (Iron-rich)
Ferruginous Sandstone (variable formula, primarily SiO2 + Fe2O3)
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Diamond
Carbon (C)
Mica schist (possibly garnet–mica schist)
Muscovite–biotite schist; chiefly quartz, feldspar, muscovite, and biotite
Quartz (beads)
SiO2 (Silicon Dioxide)
Sandstone
Sandstone (Clastic Sedimentary Rock)
Diamond
Carbon (C)
Diamond
Diamond (pure Carbon, C)
Lapis lazuli and green-blue chalcedony jewelry
Lapis lazuli: lazurite-bearing metamorphic rock, chiefly lazurite (Na₃Ca(Al₃Si₃O₁₂)S) with calcite and pyrite; second stone: likely chrysoprase or green-blue chalcedony (microcrystalline quartz, SiO₂)
Crushed Limestone
Calcium Carbonate (CaCO3)
Sandstone with Quartz Vein
Quartzose Sandstone with Hydrothermal Quartz
Granite
Felsic intrusive igneous rock
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
Limestone Fragment
Sedimentary rock (primarily Calcium Carbonate, CaCO3)
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite