Dark river pebble, likely basalt or fine-grained volcanic rock
Basalt (probable); mostly plagioclase and pyroxene, with possible magnetite
igneous
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
Learn about Man Made Material (Simulated Mineral) in the encyclopedia
View all →
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite
Sedimentary
Coarse-grained Granite or Gneiss
Granitic intrusive rock
igneous
Flint (or Chert)
Microcrystalline quartz (SiO2)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Jasper and Quartz Breccia
Silicified Breccia (SiO2)
sedimentary
Biotite (Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Translucent agate/chalcedony
Microcrystalline quartz (SiO₂), likely chalcedony with agate-like banding
mineral
Orange chalcedony or weathered quartz pebble
Microcrystalline quartz, SiO₂; possibly iron-oxide-stained chalcedony
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Fossilized Bone
Petrified Bone / Biogenic Sedimentary
fossil
Rose quartz
Quartz (silicon dioxide, SiO₂), pink massive variety
mineral
Rose quartz
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Quartz-rich pegmatitic rock (likely quartz–feldspar–mica specimen)
Granitic pegmatite; mainly quartz (SiO₂), feldspar, and dark mica/amphibole
igneous
Tumbled yellow calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Blue calcite (probable)
Calcite, CaCO₃
mineral
Sandstone (with vugs)
Arenite / Sedimentary Sandstone
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Granite Pebble (Salt and Pepper Granite)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Biotite/Amphibole)
igneous
White quartz in dark matrix (likely quartz-bearing breccia or polished composite specimen)
Quartz, SiO₂, in an unidentified dark silicate matrix
mineral
Sandstone (Calcareous)
Clastic sedimentary rock (primarily SiO2 with CaCO3 cement)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary Clastic Rock
sedimentary
White Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone (Quartzose)
Sandstone (composed primarily of Quartz: SiO2)
sedimentary
Bornite
Bornite (Cu5FeS4)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz-rich)
sedimentary
Sedimentary Sandstone (Sandstone Slab)
Arenite (SiO2 with Fe2O3 staining)
sedimentary
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Hag Stone
Perforated Sedimentary Rock (typically Limestone or Sandstone)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pegmatite with quartz, feldspar, mica, and tourmaline
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, muscovite, and black schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral