Chert (with Chalky Cortex)
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Pyrite (Fools Gold)
Iron Disulfide (FeS2)
mineral
Barite (Desert Rose or Cockscomb variety)
Barium Sulfate (BaSO4)
mineral
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Puddingstone (Gowganda Tillite/Jasper Conglomerate)
Jasper Conglomerate (SiO2 primary composition)
sedimentary
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Banded Iron Formation (BIF) / Iron Ore
Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)
sedimentary
Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
Specular Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Quartz vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Lithic Matrix
metamorphic
Rough Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Chert (variously identified as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Mica Schist (with Garnet)
Garnet-Mica Schist
metamorphic
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Common Opal/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Barite
Barium sulfate (BaSO4)
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz
Silicon Dioxide (SiO₂)
Mineral
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Banded iron formation (BIF) / Chert
Banded Iron Formation (BIF), predominantly Microcrystalline Quartz (SiO2) and Iron Oxides (Fe2O3)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Synthetic Glass
Smoky Quartz
SiO2 (Silicon Dioxide)
Mineral
Gold
Native Gold (Au)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Rough Quartz (or Quartzite pebble)
Silicon Dioxide (SiO2)
mineral