Granite
Granite (Felsic Plutonic Rock)
Category
Browse mineral within a sedimentary rock specimens identified by the Rock Identifier community.
Granite
Granite (Felsic Plutonic Rock)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
Red Jasper
Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)
Conglomerate
Conglomerate (Sedimentary rock)
Thunderegg
Agate-filled Rhyolitic Nodule (SiO2)
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
Sandstone (Pebble)
Arenite (primarily SiO2)
Shale
Shale (Sedimentary rock composed of mud/clay minerals)
Moss Agate
Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide
Ruby in Zoisite (Anyolite)
Anyolite (Combination of Corundum and Zoisite)
Sandstone
Sandstone (various mineral compositions)
Sandstone (likely Siltstone)
Arenite or Siltstone (high SiO2 content)
Sandstone
Arenite (composed primarily of SiO2)
Rough Green QuartzITE / Green Aventurine
Aventurine Quartz (SiO2 + Cr-muscovite inclusions)
Banded Chalcedony (Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Shale
Fissile Mudstone
Corundum (Sapphire in Host Rock)
Corundum (Aluminum Oxide, Al2O3)
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Pebble (Likely Basalt or Siltstone)
Clastic sedimentary rock or mafic volcanic rock
Bauxite
Bauxite (Mixture of Hydrous Aluminum Oxides)
Sandstone (Quartzite-rich Cobble)
Clastic sedimentary rock (primarily SiO2)
Milky Quartz (with Iron Oxide staining)
Quartz (Silicon Dioxide - SiO2)
Quartz Geode (Cracked)
Quartz (Silicon Dioxide, SiO2)
Quartz Geode
Silicon Dioxide (SiO2)
Peridot (Olivine)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
Heliotrope (Bloodstone)
Cryptocrystalline Quartz (SiO2) with inclusions of Hematite (Fe2O3)
Sandstone (with Iron concretions/staining)
Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)
Sandstone
Arenite (composed primarily of SiO2)
Quartz Geode (Water-worn)
Silicon Dioxide (SiO2)
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
Sandstone (Quartzose)
Sandstone (clastic sedimentary rock, primarily SiO2)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone
Arenite (SiO2 based)
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Basalt with Jasper Veining
Basaltic Rock with Cryptocrystalline Quartz (SiO2)
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)