Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
sedimentary
Category
Igneous And Metamorphic Derivative (Weathered)
Browse igneous and metamorphic derivative (weathered) specimens identified by the Rock Identifier community.
Sea Glass (Kelly Green)
Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)
Anthropogenic specimen (Man-made material)
Chert (Hagstone/Adder Stone)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone Chert/Quartzite
Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite
sedimentary
Lapis Lazuli
Lapis Lazuli (Aggregate of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Pyrite, and Calcite)
metamorphic
Gneiss
Gneiss
metamorphic
Lapis Lazuli (Tumbled Stone)
Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (predominantly Lazurite)
metamorphic
Gneiss
Gneiss
metamorphic
Quartz with Mica (Gneissic or Pegmatitic origin)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(F,OH)2)
metamorphic
Greenstone (Greenschist)
Greenschist (composed of Chlorite, Epidote, and Actinolite)
metamorphic
Black Star Diopside (beads)
Diopside (CaMgSi2O6) - a member of the pyroxene group
Mineral
Chert Geode or Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O
mineral
Chert Pebble (Flint)
Microcrystalline/Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
sedimentary
Chlorastrolite (Isle Royale Greenstone)
Chlorastrolite (Pumpellyite-(Mg,Al)), formula: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2∙H2O
mineral
Limonite (with Pyrite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Nuummite
Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)
metamorphic
Schist (specifically Chlorite/Greenschist)
Chlorite Schist
metamorphic
Pyrite (Fools Gold)
Iron Sulfide (FeS2)
mineral
Grey River Stone (Quartz-rich Quartzite/Siltstone)
Quartzite / Meta-siltstone (primarily SiO2)
Metamorphic (low-grade)
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Aquamarine with Sunstone
Aquamarine (Be3Al2Si6O18), Sunstone (Na,Ca)Al(Si,Al)Si2O8
Mineral
Gneiss
Gneiss
metamorphic
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Muscovite Mica (likely on Quartz/Feldspar)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz / Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Black Sapphire
Corundum (Al2O3 with iron and titanium impurities)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Gold Ore in Matrix
Native Gold (Au) in Quartz/Host Rock
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral