Quartz
Silicon Dioxide (SiO2)
mineral
Category
Man Made Material (Simulated Mineral)
Browse man made material (simulated mineral) specimens identified by the Rock Identifier community.
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Quartz
Silicon Dioxide (SiO2)
mineral
Garnet
Garnet group species (likely Almandine, Fe3Al2(SiO4)3)
mineral
Shark Tooth Fossil
Carcharocles megalodon or similar fossilized shark tooth
fossil
Brachiopod Fossil
Phylum Brachiopoda
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2 with trace Fe2O3)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Milky quartz fragments
Quartz (silicon dioxide, SiO₂)
mineral
Malachite-bearing copper ore
Malachite, Cu₂CO₃(OH)₂, likely mixed with chrysocolla, copper minerals, and iron oxides
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Sandstone
Arenite (SiO2 based with Fe2O3)
sedimentary
Rounded granite or granitic gneiss cobble
Granite, chiefly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Chrysocolla Chalcedony
Hydrated Copper Phyllosilicate (Cu,Al)2H2Si2O5(OH)4 + SiO2
mineral
Blue-gray metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica assemblage; exact identification requires testing
metamorphic
Snowflake Obsidian
Obsidian with Cristobalite inclusions (Amorphous SiO2 + SiO2 inclusions)
igneous
Chert (specifically Tan Chert)
Chert (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass; SiO2 content > 70%)
igneous
Chert / River Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose Sandstone)
Sandstone (SiO2 dominant composition)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Iron-stained quartzite or quartz-rich sandstone
Quartzite, predominantly SiO₂, with iron-oxide staining
metamorphic
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Petrified Dinosaur Bone (Gembone)
Agatized Dinosaur Bone
sedimentary
Sandstone (Ferruginous)
Sandstone (mainly SiO2 with Fe2O3 staining)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Tumbled prehnite (probable)
Prehnite, Ca₂Al₂Si₃O₁₀(OH)₂; possibly epidote- or chlorite-bearing
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky quartz (rough crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Weathered, quartz-rich metamorphic rock (likely schist or gneiss)
Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining
metamorphic