Shale fragment
Shale (clay mineral rich sedimentary rock)
sedimentary
Category
Mineral On Sedimentary Rock
Browse mineral on sedimentary rock specimens identified by the Rock Identifier community.
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Reddish weathered volcanic rock, probably andesite
Andesite (fine-grained plagioclase–pyroxene volcanic rock), possibly altered basalt
igneous
Limonite with Hematite
Hydrated iron(III) oxide-hydroxide with variable composition (FeO(OH)·nH2O)
mineral
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Possible fossilized shell or fossil fragment
Indeterminate; possibly a small brachiopod or gastropod fossil in mineralized matrix
fossil
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Ironstone Concretion (Boxwork)
Siderite-Limonite Concretion (FeO(OH)·nH2O)
sedimentary
Limonite Concretion
Goethite-Limonite (FeO(OH)·nH2O)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Possible fossilized shell or coral fragment
Indeterminate biogenic carbonate, likely calcite (CaCO₃)
fossil
Druzy Quartz on Matrix (likely Limestone or Sandstone)
Silicon Dioxide (SiO2) with various trace impurities
Mineral on Sedimentary Rock
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock
Quartz (chalcedony variety) or Limestone with Quartz Veins
SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)
Mineral or Sedimentary Rock (with mineral inclusions)
Calcite on Limestone
Calcium Carbonate (CaCO3) on Sedimentary Rock
mineral
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Calcite in Matrix
Calcium Carbonate (CaCO3) on Sedimentary Host Rock
mineral
Quartz with Calcite
Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)
mineral
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Red Garnet
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Coal (specifically Bituminous or Anthracite)
Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N
sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Shale
Shale (clastic sedimentary rock)
sedimentary
Weathered Sedimentary Rock
Sedimentary Rock
Sedimentary
Shale
Laminated Mudstone (Shale)
sedimentary
Calcite on Limestone (or Fossil)
Calcium Carbonate (CaCO3)
sedimentary
Quartzite with Iron Inclusions
Quartzite (pre d om i n a n t l y SiO2) with H e m a t i t e / G o e t h i t e
metamorphic
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
River Rock
Sedimentary clast
sedimentary
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Shale
Argillite / Shale
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Likely pink granite or granitic pegmatite fragment
Granite; mainly quartz (SiO₂), feldspar, and mica
igneous
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Sedimentary Rock Fragments
Clastic Sedimentary Rock
sedimentary
Brown Sandstone (River Rock)
Arenite
sedimentary
Likely bituminous coal
Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image
sedimentary