Marble
Crystalline Limestone (mostly CaCO3 / Calcium Carbonate)
metamorphic
Category
Sedimentary (Chemical)
Browse sedimentary (chemical) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite Pebble (with Quartz veins)
Quartzite (SiO2)
metamorphic
Chalcedony
Chalcedony (SiO₂)
Mineral
Blue Quartzite
Blue Quartzite (Primary mineral: Quartz, SiO2 with magnesio-riebeckite or crocidolite inclusions)
metamorphic
Orange Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Quartz (specifically Milky/Yellow Quartz)
Silicon Dioxide (SiO2)
mineral
Sapphirine in Matrix
Sapphirine (Mg,Al)8(Al,Si)6O20
mineral
Red Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz (specifically Milky or Rose Quartz variant)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)
igneous
Green Sea Glass
Amorphous Silica (man-made glass), SiO2 + additive metal oxides
mineraloid / anthropogenic (man-made origin)
Serpentine (Nephrite-like River Cobble)
Serpentinite (Hydrous Magnesium Iron Silicate)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Golden Quartz / Iron-stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Goethite or Limonite)
mineral
Rhyolite Pebble
Rhyolite
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Microcrystalline/Macro crystalline variety)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Dyed Agate Slice
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Quartz (Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Rhyolite
Rhyolite
igneous
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (primarily SiO2)
metamorphic
Limonite after Pyrite (Pseudomorph)
FeO(OH)·nH2O following FeS2
mineral
Basalt with Iron Oxidation
Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Lapis Lazuli
Na6Ca2(Al6Si6O24)(SO4,S,Cl,OH)2 (Lazurite-dominated rock)
metamorphic
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)