Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Mineral Like (Anthropogenic)
Browse mineral like (anthropogenic) specimens identified by the Rock Identifier community.
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Basalt with Jasper Vein
Extrusive Igneous Rock with Quartz/Chalcedony Vein
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Sunstone (Feldspar variety)
Oligoclase or Andesine (Na,Ca)(Al,Si)4O8
mineral
Quartz River Cobble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Sapphire
Corundum (Al2O3)
mineral
Fluorite Octahedron
Fluorite (Calcium Fluoride, CaF2)
mineral
Moss Agate with Quartz Druzy
Chalcedony with inclusions (SiO2)
mineral
Moss Agate
Silicon Dioxide (SiO2) with Chlorite/Hornblende inclusions
mineral
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Glaucophane Schist (Blueschist)
Blueschist facies metamorphic rock
metamorphic
Serpentinite
Serpentinite (composed largely of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Quartz Mineral Specimens
Quartz (Silicon Dioxide, SiO2)
mineral
Picture Jasper
Silicified sedimentary or volcanic rock (primarily SiO2)
sedimentary
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Gypsum (Selenite variety)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Orthoclase Feldspar (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
mineral
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
sedimentary
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Hematite (likely Botryoidal or Specularite variant)
Iron(III) oxide (Fe2O3)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Muscovite Mica (likely on Quartz/Feldspar)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Sunstone
Aventurine Feldspar (Plagioclase Feldspar with inclusions)
mineral
Gneiss (or Granite Gneiss)
Metamorphic rock rich in quartz, feldspar, and biotite/amphibole
metamorphic
Petrified Wood
Silicified wood (Quartz / Chalcedony replacement)
fossil
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Chert (Green variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Quartz (Milky or Rose variety)
Silicon Dioxide (SiO2)
mineral
Jasper (Banded Jasper / Chert)
Silicon Dioxide (SiO2 with iron oxide inclusions)
sedimentary
Banded Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Bone (Petrified Bone)
Permineralized Bone Fossil
fossil
Banded Sandstone
Arenite (Sandstone with iron oxide banding)
sedimentary
Rose Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Silicon
Element Si
mineral
Chrysocolla in Cuprite (Sonoran Sunrise)
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O) (Chrysocolla) and Cu2O (Cuprite)
mineral