Hematite
Iron(III) oxide (Fe2O3)
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 (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Yellow Calcite (Polished)
Calcium Carbonate (CaCO3)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Golden Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz pebble
Quartz (Silicon dioxide, SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Likely chert/flint fragment
Microcrystalline quartz (SiO₂), possibly partially weathered chert
sedimentary
Hematite Nodule
Hematite (Fe2O3)
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Banded iron formation fragment
Banded iron formation (BIF), composed mainly of hematite/magnetite and chert (SiO₂)
sedimentary
Orange calcite (honey calcite)
Calcite, calcium carbonate (CaCO₃)
mineral
Dark flint or chert fragment
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Red Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Graphite
Graphite (C)
mineral
Celestite (Celestine)
Strontium Sulfate (SrSO4)
mineral
Quartzite Pebble
Metamorphic Quartz-rich Rock
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Quartz (Clear/Crystalline)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chert Nodules in Limestone
Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone (Gozzanous)
SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating
sedimentary
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Amethyst Geode
Amethyst/Purple Quartz (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Honey Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Red Sandstone
Quartzose Sandstone (primarily quartz grains cemented by iron oxides)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Specularite (Specular Hematite)
Iron Oxide (Fe2O3)
mineral
Blue calcite (probable)
Calcite — CaCO₃
mineral
Honey calcite (likely rough calcite crystal)
Calcite, calcium carbonate (CaCO₃)
mineral