Quartz Vein Specimen
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Chemically Precipitated) Or Metamorphic
Browse sedimentary (chemically precipitated) or metamorphic specimens identified by the Rock Identifier community.
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Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint / Agate Nodule)
Silicon Dioxide (SiO2)
sedimentary
Banded sedimentary concretion
Likely a carbonate (calcite-rich) concretion with concentric mineral bands; exact composition cannot be confirmed from the image
sedimentary
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Peach/orange calcite cluster
Calcite (CaCO₃), likely botryoidal or scalenohedral aggregate
mineral
Weathered quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂); possibly quartzite, a metamorphosed quartz sandstone
metamorphic
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Veined Pebble (Quartz/Calcite Veined Metamorphic/Sedimentary Rock)
Quartz / Calcite Veined Fault Breccia or Metamorphic Pebble
metamorphic
Red Jasper Pebble
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
Mineral on Sedimentary
Milky quartz (quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Magnetite Ore
Magnetite (Fe3O4)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Milky or Iron-Stained Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Banded iron formation (specimen, possibly hematite–jasper)
Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and silica (chert/quartz), with possible limonite/goethite staining
sedimentary
Banded Calcite Onyx (Cave Onyx / Mexican Onyx)
Calcite (CaCO3) / Travertine
sedimentary
Light-colored limestone pebble
Calcite-rich limestone (primarily CaCO₃)
sedimentary
Green Chert
Microcrystalline Quartz (SiO2)
sedimentary
Eroded Limestone with Iron Staining
Carbonate Rock (CaCO3)
sedimentary
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Likely calcite specimen
Calcite, calcium carbonate (CaCO₃)
mineral
Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Limonite / Ironstone
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Raw Calcite
Calcium Carbonate (CaCO3)
mineral
Septarian Nodule
Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)
sedimentary
Banded iron formation (banded ironstone)
BIF, chiefly hematite/magnetite and microcrystalline quartz (chert); locally limonite/goethite
sedimentary
Rounded limestone pebble
Limestone, predominantly calcite (CaCO₃)
sedimentary
Calcite-rich limestone
Limestone, predominantly calcium carbonate (CaCO₃), usually calcite
sedimentary
Chert with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Iron Oxide (Fe2O3)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Clear / Rock Crystal)
Silicon Dioxide (SiO2)
Mineral