Quartzite / Sandstone / Chert Mix
Silicon Dioxide (SiO2)
sedimentary and metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Basalt
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Basalt
Basalt (Fine-grained extrusive igneous rock)
igneous
Hematite
Hematite (Fe2O3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Petrified Wood
Silicified wood (primarily Silicon Dioxide - SiO2)
metamorphic
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO₂)
metamorphic
Blue Dyed Agate
Chalcedony (cryptocrystalline variety of Quartz), SiO2
mineral
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Aquamarine
Beryl (Be3Al2Si6O18), specifically the blue-green variety
Mineral
Labradorite
Labradorite (a variety of Plagioclase Feldspar), Na(AlSi3O8) to Ca(Al2Si2O8)
Mineral
River Cobble (likely Sandstone or Siltstone type)
Sandstone or Siltstone (common rock types that form river cobbles)
Sedimentary Rock (specifically a clastic sedimentary rock formed into a cobble)
Tiger's Eye (Polished Point/Tower)
SiO2 (Silicon Dioxide) with included crocidolite fibers
Mineral (Metamorphic pseudomorph)
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Quartz Crystal
Quartz (SiO₂)
Mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Basalt
Basalt (Igneous Volcanic Rock)
igneous
Quartz Geode (partially formed/chalcedony with iron staining)
Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides
Mineral/Sedimentary Rock Feature
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Basalt with Plagioclase Phenocrysts
Porphyritic Basalt
igneous
Serpentinite
Serpentinite (a rock composed predominantly of serpentine group minerals)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt (River Stone)
Aphanitic Mafic Igneous Rock
igneous
Felsic Igneous Rock (likely Rhyolite or weathered Granite)
Felsic Volcanic/Plutonic Rock
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Green Aventurine
Aventurine (Silicon Dioxide with Fuchsite inclusions - SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Dolerite (Diabase)
Dolerite / Diabase
igneous
Aquamarine
Aquamarine (Beryl variety) - Be3Al2(Si6O18)
mineral
Basalt with Scoria/Vesicular Texture
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Coquina
Biogenic Limestone (Coquina)
sedimentary
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
Metamorphic Rock (variety of Quartz)