Jasper
Jasper / Silicon Dioxide (SiO₂)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
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Likely weathered basalt
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Green Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Conglomerate
Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)
sedimentary
Chert (often called Jasper or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion / Chert Nodules
Iron-rich Sedimentary Concretion (Fe2O3 / SiO2 mix)
sedimentary
Basalt
Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine
Igneous
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Chert (Flint) Nodule
Cryptocrystalline Quartz (SiO2)
sedimentary
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Gneiss (Granitic Gneiss)
Gneiss (composed primarily of Quartz, Feldspar, and Mica)
metamorphic
Tumbled white quartz or quartzite pebble
Quartz (SiO₂), possibly massive quartzite
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Lapis Lazuli
Lapis Lazuli (Rock composed mainly of lazurite, calcite, and pyrite)
gemstone
Rounded greenish river pebble, likely basalt or altered volcanic rock
Probable basalt (fine-grained mafic silicate rock), possibly epidote/chlorite-altered
igneous
Weathered quartz-rich rock, likely granite or granitic gneiss
Granite (quartz–feldspar–mica aggregate), possibly weathered granitic gneiss
igneous
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with impurities
sedimentary
Weathered limestone
Calcite-rich carbonate rock (mostly CaCO₃), possibly fossiliferous limestone
sedimentary
Basalt
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine
igneous
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Dalmatian Jasper
Feldspar porphyry (Microcline and Quartz with Arfvedsonite spots)
igneous
Granite
Felsic intrusive igneous rock
igneous
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2)
mineral
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Red Sandstone / Quartzite Pebble
Quartz Arenite / Quartzite
sedimentary
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Devil's Toenail
Gryphaea (extinct genus of foam oysters, typically composed of Calcite CaCO3)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Slate
Metamorphic Rock (Fine-grained)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Sandstone
Clastic Sandstone (typically Quartz-rich with Iron Oxide)
sedimentary
River Pebble
Siliceous rock fragment / Quartzite / Sandstone pebble
sedimentary