Milky Quartz with Mineral Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
Granite / Gneiss Complex
Felsic Plutonic Rock (Granite) or High-grade Metamorphic Rock (Gneiss)
igneous/metamorphic
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Shale
Shale (composition varies: primarily clay minerals and quartz)
sedimentary
Chert Concretion (with typical hematite/limonite staining)
Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)
sedimentary
Amethyst (Rough)
Silicon Dioxide with iron impurities (SiO2)
mineral
Quartz Pebble (River Rock)
Silicon Dioxide (SiO₂)
Mineral
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Chert with Brachiopod Impression
Chert (SiO2) containing Brachiopoda fossil remains
sedimentary
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Porphyry (specifically Porphyritic Rhyolite or Andesite)
Porphyritic Igneous Rock (composed of Phenocrysts in an Aphanitic groundmass)
igneous
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Orange Quartzite (River Pebble)
Quartzite (SiO2 with Iron Oxide inclusions)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)
Igneous
Geode with Quartz/Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Vesicular Basalt with Quartz
Vesicular Basalt (SiO2 inclusions)
igneous
Rhyolite
Rhyolite (Extrusive Felsic Igneous Rock)
igneous
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Serpentinite
Serpentinite
metamorphic
Raw Diamond (Rough Uncut)
Diamond (C - pure carbon)
mineral
Amethyst Geode
Amethyst (Silicon Dioxide), Formula: SiO2
mineral
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Note: Item is not a geological specimen
Guitar Components (Steel, Nickel, Plastic, Wood)
Synthetic/Consumer Product
Chert Conglomerate (or Breccia)
Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Sandstone
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite with Orthoclase and Hematite Staining
Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
igneous
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Rhyolite (Porphyritic)
Rhyolite (Felsic Extrusive Igneous Rock)
igneous
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Basalt with Secondary Mineral Inclusions
Amygdaloidal Basalt (Mafic volcanic rock, primarily Augite and Plagioclase)
igneous
Sandstone (Pebble/Cobble)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Chert (Jasper variation)
Silicon dioxide (SiO2)
sedimentary
Granite
Granite (Felsic Plutonic Rock)
igneous
Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))
mineral
Pumice or Scoria
Vesicular volcanic rock
Igneous
Jasper with Quartz Vein
Silicon Dioxide (SiO2) with impurities
sedimentary