Basalt Pebble
Mafic Volcanic Rock (Basalt)
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.
Learn about Sedimentary (Secondary Classification For A Weathered Mineral Specimen) in the encyclopedia
View all →
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (SiO2 with assorted lithic fragments)
sedimentary
Geode (Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt River Pebble
Basalt
igneous
Biotite Mica
K(Mg, Fe)3AlSi3O10(F, OH)2
mineral
Siltstone with Weathering Rind
Siltstone (composed of microscopic quartz and clay minerals)
sedimentary
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite
Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)
sedimentary
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Sandstone
Arenite (primarily SiO2, silica)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous
Basalt River Rock
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt with Quartz Veining
Basalt (Mafic Extrusive Igneous Rock) with SiO2 (Silicon Dioxide) veins
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Breccia Pebble
Sedimentary Breccia
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite (or Milky Quartz pebble)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Basalt with Fusion Crust (Meteorite-like appearance)
Vesicular Basalt
igneous
Carnelian Agate
Silicon Dioxide (SiO2) with iron impurities
mineral
Wishing Stone (Basalt/Siltstone with Quartz/Calcite vein)
Carbonaceous Siltstone with Quartz (SiO2) or Calcite (CaCO3) vein
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode with Calcite
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
Mineral/Geode
Diabase (Greenstone)
Diabase or Dolerite
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (clastic)
Clastic Sedimentary Rock (primarily composed of SiO2)
sedimentary
Jasper Beach Pebble
Silicon Dioxide (SiO2) - Macro-crystalline Quartz
sedimentary
Granite Cobble
Granite (Felsic intrusive igneous rock)
igneous
Glauconitic Sandstone (or Greenstone)
Glauconitic Sandstone with Quartz
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone with Iron Oxide Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Fossiliferous Limestone Pebble
Biogenic Sedimentary Rock (CaCO3)
fossil
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Iron-Oxide Concretion (Moqui Marble)
Goethite/Hematite Concretion (Fe2O3 / FeO(OH))
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous