Selenite (variety of Gypsum)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Category
Sedimentary (Secondary Classification For A Weathered Mineral Specimen)
Browse sedimentary (secondary classification for a weathered mineral specimen) specimens identified by the Rock Identifier community.
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Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Vanadinite
Lead Chlorovanadate, Pb5(VO4)3Cl
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Andesite Porphyry (River Cobble)
Porphyritic Andesite
igneous
Fire Opal (in matrix)
Hydrated Silica (SiO2·nH2O)
Mineraloid
Chert Pebble (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Pebble)
Quartz (SiO₂)
Mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pebble (Likely Basalt or Siltstone)
Clastic sedimentary rock or mafic volcanic rock
Igneous or Sedimentary
Unidentifiable Specimen
Undetermined
Unknown
Chert (with Fossiliferous Silicification)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Chert (Iron-rich or Jasperoid)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint Pebbles)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Quartz River Cobble
Silicon Dioxide (SiO2)
mineral
Shale (with minor calcite veining)
Clastic sedimentary rock (primarily clay minerals and quartz)
sedimentary
Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Granite or Granodiorite (weathered fieldstone)
Granitoid
igneous
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
mineral
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Carnelian
Silicon dioxide (SiO2) with Iron Oxide impurities (Fe2O3)
mineral
Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone (Gneissic or Banded)
Clastic Sedimentary Rock (composed predominantly of SiO2)
sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
sedimentary
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Quartz (Clear/White)
Silicon Dioxide (SiO2)
mineral
Feldspar (Orthoclase/Microcline)
Potassium Feldspar (KAlSi3O8)
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Sagenitic Agate (with Goethite/Rutile inclusions)
Silicon Dioxide (SiO2) with hydrous ferric oxide inclusions
mineral
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
igneous
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Amygdaloidal Rhyolite
Amygdaloidal felsic extrusive rock
igneous
Chalcopyrite in Quartz (Gossan/Iron Hat)
CuFeS2 (Chalcopyrite) with SiO2 (Quartz)
mineral