Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
Browse industrial byproduct (anthropogenic rock like material) specimens identified by the Rock Identifier community.
Sandstone
Clastic Sedimentary Rock (composed of SiO2 grains)
sedimentary
Diamond
Diamond (Carbon, C)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
sedimentary
Sandstone (Ferruginous)
Arenite with Iron oxide staining (SiO2 with Fe2O3)
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Pebble (likely a type of sandstone or quartzite pebble)
Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.
Sedimentary rock
Chiastolite (Andalusite)
Al2SiO5
metamorphic
Schist
Mica Schist
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Obsidian (principally SiO2)
igneous
Quartzite (Gold/Tan River Cobble)
Quartzite (composed primarily of crystalline SiO2)
metamorphic
Moissanite
Silicon Carbide (SiC)
mineral
Granite or Pegmatite in host rock
Granitoid / Felsic Intrusive Rock
Igneous
Sandstone (Red)
Arenite (SiO2 with Fe2O3)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
metamorphic
Chalcedony (Botryoidal or Agate nodule)
Silicon Dioxide (SiO2)
mineral
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Microcrystalline Quartz (SiO2) with hydration
sedimentary
Chert (varieties include Flint and Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Biotite Schist
Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Chert (varieties: Flint or Chalcedony)
Microcrystalline silica (SiO2)
sedimentary
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Diamond (in a gold ring)
Diamond (pure carbon, C)
mineral
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Jasper Breccia
Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebbles
Meta-quartzite (SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide cement (primarily Fe2O3 • nH2O)
sedimentary
Sandstone (Quartzose)
Arenite (Formula: SiO2 primary, with various cements)
sedimentary
Gneiss
Gneiss
metamorphic
Clear Quartz (Carved Dragon)
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Schist
Mica Schist
metamorphic
Coquina
Bioclastic Limestone
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2 based)
sedimentary