Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
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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Horn Coral Fossil
Order Rugosa
fossil
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Basalt River Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Sandstone (Glacial Cobble)
Arenite / Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (likely Arkose)
Arenite (composed mainly of SiO2 with Feldspar)
sedimentary
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
igneous, sedimentary, or metamorphic (mineral-based)
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Blue Celestite (with Galena)
Strontium sulfate (SrSO4) and Lead sulfide (PbS)
mineral
Amygdaloidal Basalt with Agate/Quartz Infill
Basalt with Secondary Silicate Mineralization (SiO2)
igneous
Granite Cobble
Felsic intrusive igneous rock
igneous
Quartzite (River Cobble)
Quartzite (SiO2)
metamorphic
Blue Lace Agate (Geode/Druzy variant)
Chalcedony (SiO2) with Quartz druzy
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Garnet (specifically Almandine)
Almandine - Fe3Al2(SiO4)3
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
Mineral
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
River Jasper (Chert/Chalcedony mix)
Silicon Dioxide (SiO2) with iron oxide and chlorite inclusions
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Milky Quartz in Conglomerate Matrix
Silicon Dioxide (SiO2) within Clastic Sedimentary Rock
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Basalt River Cobble
Basalt (Mafic Extrusive Igneous Rock)
igneous
Red Sandstone
Arenite
sedimentary
Yellow Chalcedony
Silicon Dioxide (SiO2)
mineral
Sandstone (Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Granite Glacial Erratic
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granodiorite (River Pebble)
Granodiorite
igneous
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)
mineral
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Siderite Concretion
Ironstone (Siderite) Concretion, FeCO3
sedimentary
Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)
Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.
Metamorphic or Sedimentary (with staining)
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Geode or Druzy Quartz in Host Rock
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary