Green Aventurine (Quartzite)
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Granodiorite with Quartz Veining
Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins
igneous
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
mineral
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Basalt (Weathered River Stone)
Basalt (Extrusive Mafic Igneous Rock)
igneous
Basalt with Quartz/Calcite Veins
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Basalt
Mafic Igneous Rock
igneous
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Quartzite (or Milky Quartz pebble)
Quartzite (Metamorphosed Sandstone) / Silicon Dioxide (SiO2)
metamorphic
Quartz (Milky/Opaque variety)
Silicon Dioxide (SiO2)
mineral
Grey Basalt Pebble
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Basalt (Polished River Stone)
Aphanitic Mafic Igneous Rock
igneous
Turquoise (Dyed Howlite/Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)
mineral
Granite Pebble
Felsic intrusive igneous rock
igneous
Granodiorite
Granodiorite
igneous
Granodiorite
Phaneritic-textured Intrusive Granodiorite
igneous
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Blue Crackle Quartz (Dyed Quarzite)
Silicon Dioxide (SiO2) with artificial dye
Metamorphic (modified)
Green Onyx (Banded Calcite)
Travertine (CaCO3 - Calcium Carbonate)
sedimentary
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Chlorite (Small Flakes/Sand)
Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
White Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Scoria (Lava Rock)
Scoriaceous Basalt
igneous
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
metamorphic
Pumice
Pumice (Alveolar Rhyolite / Dacite / Andesite)
igneous
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Tufa (Vesicular Limestone)
Tufa (form of Calcium Carbonate, CaCO3)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Sandstone (Red Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)
sedimentary
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
River Siltstone / Mudstone Pebble
Siltstone (composed of mixed silicate and carbonate minerals)
sedimentary
Sandstone (Picture Sandstone)
Sandstone (primarily Quartz with Iron Oxide impurities)
sedimentary