White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Not A Geological Specimen
Browse not a geological specimen specimens identified by the Rock Identifier community.
Quartz crystal with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Red Sandstone (Siltstone/Mudstone variety)
Ferruginous Sandstone (composed primarily of Quartz with Hematite cementation)
sedimentary
Lapis Lazuli (prominent blue specimen in collection)
Lazurite-rich metamorphic rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2
metamorphic
Rock Crystal Quartz
Quartz (SiO₂)
Mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Green Aventurine (Green Quartz)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
Mineral/Metamorphic rock
Green Jasper (Heliotrope / Bloodstone variety)
Silicon Dioxide (SiO₂)
sedimentary
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Grey Quartzite Pebble
Quartzite (primarily SiO2 - Silicon Dioxide)
metamorphic
Granite (Pink/Potassium Feldspar Granite)
Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)
igneous
Rose Quartz
Silicon Dioxide with traces of titanium, iron, or manganese (SiO2)
mineral
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Sandstone (Water-worn Pebble)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granite Pebble (Salt and Pepper Granite)
Felsic Intrusive Igneous Rock (Granite)
igneous
Amethyst Geode/Cluster
Quartz (SiO2) - variety Amethyst
Mineral
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Basalt (Purple-tinted scoria/vesicular variety)
Extrusive mafic igneous rock (SiO2 range 45–52%)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))
mineral
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Orange Quartz with Hematite inclusions
Quartz (SiO2) with Hematite (Fe2O3) inclusions
Mineral
Granite (with alteration)
Granite (Felsic intrusive igneous rock)
igneous
Quartz (specifically Milky Quartz/Quartzite)
Silicon Dioxide (SiO2)
Mineral
Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Quartz
Quartz (SiO₂)
Mineral
Black Obsidian with white veins
Volcanic Glass (70–75% SiO2)
igneous
Quartz Druze (on Matrix)
Silicon Dioxide (SiO2)
mineral
Coarse-grained Granite (Quartz and Feldspar dominated)
Granitoid (KAlSi3O8 – NaAlSi3O3 – CaAl2Si2O8 – SiO2)
Igneous
Basalt Pebble
Basalt (Extrusive Mafic Igneous)
igneous
Quartzite (Beach Pebble)
Quartzite (primarily SiO2)
metamorphic
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Gneiss
Gneiss
metamorphic
Asphalt (Aggregate)
Bituminous macadam / Concrete Aggregate
sedimentary
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Jasper with Pyrite (Gold-colored inclusions)
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
sedimentary (chemical/biological)
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous