Weathered gray-green pebble
Indeterminate; possibly altered basalt, serpentinite, or a greenish metamorphic rock
mineral
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Possibly Composed Of Various Minerals) in the encyclopedia
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Granite
Intrusive Felsic Igneous Rock
igneous
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Flagstone (Sandstone)
Clastic Sedimentary Rock (composed of quartz and feldspar)
sedimentary
Quartz-rich rock, likely chert or chalcedony
Microcrystalline silica (SiO₂), possibly quartz/chalcedony
mineral
Quartz (likely milky quartz or a stained variety)
Silicon Dioxide (SiO₂)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pebble with Basaltic and Quartz-rich Banding
Polymictic Lithic Pebble
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (and Fossiliferous Chert)
Silicon Dioxide (SiO2)
sedimentary
Jasper (Mookaite style)
Jasper (Silica-rich Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Dalmatian Stone
Peralkaline rhyolite
igneous
Gabbro
Phaneritic Basic Igneous Rock
igneous
Pyrite-bearing Rock / Pyrite Ore
Iron Sulfide (FeS2) in host rock matrix
mineral
Diorite
Intrusive Igneous Rock (Intermediate Composition)
igneous
Labradorite
(Ca, Na)(Al, Si)4O8 (Plagioclase Feldspar)
mineral
Dalmatian Stone
Dalmatian Stone (a fine-grained igneous rock, often misidentified as Dalmatian Jasper)
igneous
Yellow calcite crystal cluster with calcite fragment
Calcite, calcium carbonate (CaCO₃)
mineral
Sandstone (Ferruginous)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Bumblebee Jasper (technically Bumblebee Stone)
Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)
sedimentary (volcanic)
Sandstone (Greywacke/Lithic Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Polished/tumbled metallic sulfide specimen, likely pyrite
Pyrite (FeS₂), possibly mixed with chalcopyrite or other sulfides
mineral
Orbicular/porphyritic granite or granitic pegmatite
Quartz–feldspar–mica granitic rock, possibly orbicular granite
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Weathered quartz-rich pebble (likely milky quartz or quartzite)
Quartz, silicon dioxide (SiO₂); possibly quartzite, a metamorphic quartz rock
mineral
Biotite granite (weathered granitic rock)
Granite; chiefly quartz (SiO₂), feldspar, and biotite mica
igneous
Sandstone
Clastic sedimentary rock (Quartz arenite / Arkose)
sedimentary
Blue Chalcedony (Tumbled)
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Chalcedony in Matrix
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Red Quartz (Druzy)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Jasper with Iron Staining
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Bauxite
Hydrated aluminium oxides mixture (primarily gibbsite, boehmite, and diaspore)
sedimentary
Red Sandstone
Quartzose Sandstone (SiO2)
sedimentary
Granite Pebble
Granite
igneous
Carnelian
Carnelian (Chalcedony/Quartz, SiO2)
mineral
Sandstone
Arenite (composed of SiO2, CaCO3, or iron oxides)
sedimentary
Sandstone Pebbles
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary