Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Polished Picasso jasper
Silicified carbonate rock, commonly marketed as Picasso jasper; composition varies and is not a single mineral species
metamorphic
Rough White Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Peridotite
Peridotite (varieties include Dunite, Lherzolite, Harzburgite)
igneous
Smoky Quartz (Ferruginous Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
gemstone
Quartzite
Quartzite (SiO2)
metamorphic
Wild Horse Magnesite
Magnesite with Hematite inclusions (MgCO3)
mineral
Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Anthracite Coal
Anthracite
metamorphic
Likely polished bronzite or serpentine-rich rock
Probable bronzite, an iron-bearing orthopyroxene (Mg,Fe)SiO₃; exact identification requires testing
mineral
Pink Himalayan Salt Rock (Halite)
Halite (Sodium Chloride, NaCl)
mineral
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Limestone with Fossil Inclusion
Calcium Carbonate (CaCO3)
sedimentary
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Quartz Druzy / Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geode formation
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz River Pebble
Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
gemstone
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Polished brown jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions
gemstone
Polished brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Chalcedony (Botryoidal/Drusy Quartz)
Silicon Dioxide (SiO₂)
Mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sapphire
Corundum (Al2O3)
mineral
Chalcedony Geode / Agate Nodule
Cryptocrystalline Quartz (SiO2)
mineral
Fenestella Bryozoan Fossil
Fenestella (class Stenolaemata)
fossil
Agate
Chalcedony (Cryptocrystalline variety of Quartz, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Druzzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rounded river or beach pebble
Likely quartz-rich sandstone or quartzite; exact identification requires a close-grained view and hardness test
sedimentary
Agate (River Pea)
Microcrystalline Chalcedony (SiO2)
sedimentary
Jasper and Agate
Microcrystalline Quartz (SiO2)
sedimentary
Schorl (Black Tourmaline) in Matrix
Sodium Iron Aluminum Borosilicate Hydroxide (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary