Sandstone (Ferruginous)
Arenite (Fe-oxide cemented)
sedimentary
Category
Sedimentary Mineral
Browse sedimentary mineral specimens identified by the Rock Identifier community.
Learn about Sedimentary Mineral in the encyclopedia
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Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Geode half
Geode (often quartz/chalcedony based)
sedimentary or igneous
Rounded river pebble
Indeterminate lithic clast; likely weathered sandstone or quartz-rich sedimentary rock
sedimentary
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Gold Mineral
Native Gold (Au)
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Blue Howlite (Dyed)
Dyed Howlite (Calcium Borosilicate Hydroxide, Ca2B5SiO9(OH)5)
mineral
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Sandstone and River Pebbles
Sedimentary Rock (Sandstone / Quartzite / Chert)
sedimentary
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Agate
SiO2
mineral
Chalcopyrite
Copper iron sulfide (CuFeS2)
mineral
Limonite/Ironstone
Limonite (FeO(OH)·nH2O)
mineral
Quartz-veined Sandstone
Sedimentary rock with quartz vein (SiO2)
sedimentary
Limonite (Ironstone)
FeO(OH)·nH2O
sedimentary
Limonite / Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Geode (Unopened)
Quartz/Chalcedony concretion
sedimentary
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite (Fools Gold)
Iron Disulfide (FeS2)
mineral
Quartz (Milky/Snow)
Silicon Dioxide (SiO2)
mineral
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
River Pebble (Siltstone / Fine-grained Sandstone)
Sedimentary Pebble (Siliclastic)
sedimentary
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Gneiss
Gneiss
metamorphic
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Caribbean Calcite
Calcium Carbonate with Argonite (CaCO3)
mineral
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Sandstone (principally SiO2 with iron oxide impurities)
sedimentary