Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Agate Geode / Nodular Chalcedony
Silicon Dioxide (SiO2) with impurities
mineral
Amazonite
Tectosilicate Microcline (KAlSi3O8)
mineral
Blue Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
gemstone
Blue Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Chert with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions (70–75% SiO2)
igneous
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Uncertain small pale mineral fragment
Indeterminate; possibly calcite or a light-colored feldspar fragment
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)
sedimentary
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Likely porphyritic igneous rock (possibly granite or rhyolite)
Quartz–feldspar–mica aggregate; exact identification requires a fresh surface and tests
igneous
Smoky quartz
Quartz, silicon dioxide (SiO₂), brown to gray variety
mineral
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline to granular SiO₂, possibly with mica and feldspar
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled amethyst
Quartz, SiO₂; purple variety colored mainly by iron impurities and irradiation
gemstone
Carved quartz (likely rose quartz and green aventurine/quartz)
Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine
gemstone
Chert (flint), likely with iron-stained weathering rind
Microcrystalline quartz/chalcedony (SiO₂)
sedimentary
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly quartz (SiO₂), with minor feldspar, mica, and iron-oxide staining
metamorphic
Fossiliferous limestone, possibly an oyster or other bivalve fossil
Calcite (CaCO₃) shell material preserved in micritic limestone; exact fossil taxon cannot be confirmed from one image
fossil
Granite
Phaneritic intrusive igneous rock
igneous
Agate
Cryptocrystalline quartz, SiO2
mineral
Diamond (Cut and Polished)
Diamond (pure Carbon, C)
gemstone
Dalmatian Stone
Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Mineral
Marble
Recrystallized Calcite / Dolomite (CaCO3)
metamorphic
Fluorite (Rainbow Fluorite Tower)
Fluorite (Calcium Fluoride, CaF2)
mineral
N/A (The provided image is a storyboard/digital document)
N/A
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz (Water-Worn Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Mixed collection of common river stones
Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material
igneous, sedimentary, metamorphic
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Basalt
Extrusive Igneous Rock
igneous