Pyrite
Iron Sulfide (FeS2)
mineral
Category
Sedimentary (Anthropogenic)
Browse sedimentary (anthropogenic) specimens identified by the Rock Identifier community.
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Carnelian
Carnelian (Silicon Dioxide: SiO2 with Iron Oxide impurities)
mineral
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Kambaba Jasper
Stromatolite (Microbial mat fossil in silicified sediment)
sedimentary
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Quartz (Citrine/Yellow Jasper)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Chert (Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Geode (unopened nodule)
Silicon Dioxide (SiO2) Nodule
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Common Opal/Chalcedony mixture)
Silicon Dioxide (SiO2)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Breciated Chert
Brecciated Chert (Microcrystalline Quartz, SiO2)
sedimentary
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
mineral
Garnet (Almandine)
Almandine, Fe3Al2(SiO4)3
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Milky/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Graphite
Graphite (Carbon, C)
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Amethyst (Geode/Druzy)
Silicon Dioxide (SiO2) with iron impurities
mineral
Celestine (or Celestite)
Strontium sulfate (SrSO4)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral