Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Category
Sedimentary (Chemically Precipitated)
Browse sedimentary (chemically precipitated) specimens identified by the Rock Identifier community.
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Tumbled chalcedony / quartz pebble
Microcrystalline quartz (SiO₂), likely chalcedony with iron-oxide staining
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Dalmation Stone (Dalmation Jasper)
Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)
igneous
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz-rich translucent pebble, possibly iron-stained quartz or chalcedony
Quartz (SiO₂), potentially microcrystalline quartz (chalcedony)
mineral
Chert (Iron-stained or Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Aragonite (polished)
Aragonite (CaCO3)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Metallic sulfide ore, possibly pyrite-rich
Pyrite (FeS₂), potentially mixed with chalcopyrite, galena, or iron oxides
mineral
Chert (Polished River Pebble)
Chert (SiO2)
sedimentary
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Common Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Impression Jasper
Microcrystalline Quartz (SiO2)
gemstone
Jasper
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst Cluster
Silicon Dioxide (Quartz), SiO2
mineral
Dendritic Opal
Hydrated amorphous silica with manganese oxide inclusions (SiO2·nH2O)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
SiO2 (Silicon Dioxide)
mineral
Jasper
Microcrystalline quartz, SiO2
sedimentary
Jasper
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Hematite
Iron Oxide (Fe2O3)
mineral
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Chert/Flint Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Likely weathered sandstone or iron-stained limestone fragment
Indeterminate clastic carbonate/siliciclastic rock; likely quartz-rich sandstone or porous limestone with iron-oxide staining
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Weathered limestone
Calcite-rich limestone (CaCO₃), possibly chalky micritic limestone
sedimentary
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral