Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
Gold Ore in Quartz
Auriferous Quartz (Au + SiO2)
igneous
Basalt (tumbled/river-worn)
Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)
igneous
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Sapphire
Corundum (Al2O3)
mineral
Sandstone (Water-worn Cobble)
Arenite (SiO2 based)
sedimentary
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt (Weathered)
Extrusive Igneous Rock (Mafic composition)
igneous
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Massive Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (volcanic glass froth)
igneous
Quartzite (Gold/Tan River Cobble)
Quartzite (composed primarily of crystalline SiO2)
metamorphic
Garnet Schist
Almandine-Mica Schist
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
White Sapphire
Corundum (Al2O3)
mineral
Yooperlite
Fluorescent Sodalite-bearing Syenite
igneous
Basalt
Basalt (Mafic igneous rock)
igneous
Pink Quartzite
Quartzite (mainly SiO2 with iron oxide impurities)
metamorphic
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Magnetite
Magnetite (Fe3O4)
Mineral
Garnet (specifically Almandine or Pyrope)
Almandine (Fe3Al2Si3O12) or Pyrope (Mg3Al2Si3O12)
mineral
Chert (Jasper/Quartzite)
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Milky Quartz
Quartz / Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granodiorite
Granodiorite (Na,Ca)(Al,Si)4O8
igneous
Citrine
SiO2 (Silicon Dioxide)
mineral
Blue Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Corundum (Sapphire in Host Rock)
Corundum (Aluminum Oxide, Al2O3)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (composition predominately plagioclase feldspar and pyroxene)
igneous
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Hypersthene
Hypersthene (Enstatite variety), (Mg,Fe)SiO3
Mineral
Pumice
Vesicular volcanic glass
igneous
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral