Pyrite with Limonite/Goethite Alteration (Pseudomorph)
Iron Sulfide (FeS2) transitioning to Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Category
Sedimentary (Biogenic)
Browse sedimentary (biogenic) specimens identified by the Rock Identifier community.
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (amorphous organic polymer)
mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Quartzite Cobble
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite River Stone
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Quartzite (or Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2) with Ferric Oxide inclusions
metamorphic
Fossilized Shark Tooth (Otodus obliquus)
Otodus obliquus (Mineral: Fluorapatite)
mineral
Goethite (Iron Ore)
Goethite (FeO(OH))
mineral
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
metamorphic
Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, primarily FeO(OH)·nH2O)
mineral
Yellow Ochre / Limonite
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Common Opal/Chert variety)
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Fossil Shark Teeth (likely Sand Tiger Shark)
Carcharias taurus (fossilized dentition)
fossil
Limonite-stained Chert
Microcrystalline Quartz (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)
sedimentary
Limestone (specifically Fossiliferous or Crinoidal Limestone)
Calcium Carbonate (CaCO3) - Calcite Rock
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Red Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)
sedimentary
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
sedimentary
Shale with Limonite/Hematite Staining
Argillaceous sedimentary rock with Iron Oxides (FeO(OH)·nH2O / Fe2O3)
sedimentary
Hag Stone
Naturally holed stone (typically sedimentary rock such as flint, limestone, or sandstone)
Sedimentary
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Hematite (Nodular or Botryoidal)
Iron(III) oxide (Fe2O3)
mineral
Hematite Concretion
Iron(III) oxide (Fe2O3)
mineral
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Siltstone (Iron-rich)
Ferruginous Siltstone
sedimentary
Mookaite Jasper
Silicified radiolarite (SiO2)
sedimentary
Chert (Nodular)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Fancy Jasper (Ocean Jasper or River Jasper variant)
Silicon Dioxide with inclusions (SiO2)
sedimentary