Chalcedony (Agate/Carnelian precursor)
Chalcedony (Silicon Dioxide, SiO2)
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 Igneous Rock
igneous
Siltstone Pebble
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Arkosic Sandstone
Arkose
sedimentary
Banded calcite (likely marble or calcite-rich limestone)
Calcite, CaCO₃; possibly calcitic marble
metamorphic
Quartz (with iron oxide staining)
Silicon Dioxide (SiO2)
mineral
Fancy Jasper (Agate/Chert mix)
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Tumbled chalcedony or quartz-rich stone
Microcrystalline quartz, SiO₂; possibly pale chert or chalcedony
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Polished orbicular/porphyritic granite or breccia
Likely potassium-feldspar–quartz granite with amphibole/biotite and epidote; exact variety uncertain from the image
igneous
Tiny metallic mineral fragment, possibly native gold
Native gold (Au), unconfirmed; could also be pyrite or chalcopyrite
mineral
Banded Chert (likely Flint or Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Mica Schist
Schist
metamorphic
Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Lapis Lazuli
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Weathered sandstone pebble
Ferruginous quartz arenite (iron-stained sandstone)
sedimentary
Lichen-covered graywacke or granitic glacial cobble
Indeterminate; likely quartz–feldspar–mica rock, possibly weathered granite or granodiorite
igneous
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-bearing jasper
mineral
Mixed Gravel and Pebbles
Polylithic Alluvial Aggregate
igneous, sedimentary, and metamorphic mix
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone containing a Brachiopod or Mollusk Impression
Biogenic Sedimentary Rock / Fossiliferous Limestone
sedimentary
Pyrite-bearing quartz vein rock
Pyrite (FeS₂) in quartz, possibly with iron-oxide weathering products
mineral
Red Sandstone
Arenic rock (composed mainly of SiO2 with Fe2O3)
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Jasper
Jasper (Silicon Dioxide, SiO2)
mineral
Siltstone
Siltstone (primarily composed of quartz and clay minerals)
sedimentary
Rounded brown-gray stone, possibly weathered conglomerate or sandstone
Indeterminate clastic sedimentary rock; likely poorly cemented sandstone/conglomerate
sedimentary
Chert
Silicon dioxide (SiO2)
Sedimentary
Banded Agate
Cryptocrystalline Silicon Dioxide (SiO2)
gemstone
Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral
Conglomerate
Clastic Sedimentary Rock (Puddingstone)
sedimentary
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Weathered granite or granitic gneiss
Granite; primarily quartz, feldspar, and mica (possibly metamorphosed to gneiss)
igneous