Serpentine (Nephrite-like River Cobble)
Serpentinite (Hydrous Magnesium Iron Silicate)
metamorphic
Category
Sedimentary (Physico Chemical Precipitate)
Browse sedimentary (physico chemical precipitate) specimens identified by the Rock Identifier community.
Quartzite
Quartzite (SiO2)
metamorphic
Golden Quartz / Iron-stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Goethite or Limonite)
mineral
Rhyolite Pebble
Rhyolite
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Dyed Agate Slice
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Rhyolite
Rhyolite
igneous
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 (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Obsidian (in jewelry setting)
Volcanic Glass (Amorphous Silica)
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral
Drupa Quartz (Sparkly Drusy Quartz on Matrix)
Crystalline Silicon Dioxide (SiO2) on host rock
mineral
Tektite (Indochinite)
Tektite (Amorphous silica-rich impact glass)
igneous
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxides
mineral
Slag Glass
Amorphous Silica / Glass Slag
industrial byproduct (anthropogenic rock-like material)
Granite (specifically Rapakivi Granite)
Phaneritic Felsic Igneous Rock (Granite)
igneous
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Serpentine
Serpentine group, including Antigorite, Lizardite, and Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
River Quartzite (River Rock)
Quartzite (SiO2)
metamorphic
Botryoidal Chalcedony (Agate/Carnelian)
Chalcedony (SiO2)
mineral
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Gold Nugget
Native Gold (Au)
mineral
Talc (Soapstone variety)
Talc (Hydrated magnesium silicate) - Mg3Si4O10(OH)2
mineral
Quartz / Quartzite Fragment
Silicon Dioxide (SiO2)
mineral / metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Garnet (likely Almandine, Pyrope, or a blend)
Garnet group minerals: X3Y2(SiO4)3, where X and Y represent various metal ions (e.g., Almandine: Fe3Al2(SiO4)3, Pyrope: Mg3Al2(SiO4)3)
Mineral
Slate
Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)
metamorphic