Small rounded quartz pebble
Quartz (SiO₂), likely milky or iron-stained quartz
mineral
Category
Man Made Object (Simulant)
Browse man made object (simulant) specimens identified by the Rock Identifier community.
Learn about Man Made Object (Simulant) in the encyclopedia
View all →
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Native Gold (in Jewelry)
Gold (Au)
mineral
Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)
BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel
mineral
Limestone
Sedimentary rock composed mainly of calcium carbonate (CaCO3)
sedimentary
Quartz-rich pegmatite (likely feldspar–quartz rock)
Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining
igneous
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzite-rich)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pumice
Pumice (Felsic volcanic rock)
igneous
Tumbled lepidolite-rich pegmatite (probable)
Lepidolite, K(Li,Al)3(Si,Al)4O10(F,OH)2, in a granitic pegmatite matrix
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Greywacke
Dirty Sandstone (Lithic wacke)
sedimentary
Pumice
Pumice (a highly vesicular extrusive igneous rock, primarily amorphous silica)
igneous
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Basalt (River Rock pebble)
Basalt (a mafic extrusive igneous rock)
igneous
Peacock Ore
Bornite (Cu5FeS4)
mineral
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Pebble (likely Quartz or Chert)
SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.
Sedimentary Rock
Quartzite
Recrystallized Silicon Dioxide (SiO2)
metamorphic
Dalmatian Jasper
Peralkaline Quartz Feldspar Porphyry
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Dark basalt or basaltic volcanic rock
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine
igneous
Quartzite River Cobble
Quartzite (SiO2)
metamorphic
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Quartz Crystals
Silicon Dioxide (SiO2) with artificial pigment
mineral
Unakite
Unakite (metamorphosed granite)
metamorphic
Seashell (Cockle Shell)
Cardiidae (Bivalvia), primary composition: Calcium Carbonate (CaCO3) in the form of aragonite or calcite
fossil
Quartz (Milky/Gold-stained)
Silicon Dioxide (SiO2)
mineral
Unakite
Epidotized Granite
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chondrite Meteorite
L or H Ordinary Chondrite
meteorite