Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
sedimentary
Category
Man Made (Synthetic Rock)
Browse man made (synthetic rock) specimens identified by the Rock Identifier community.
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
sedimentary
Eclogite
Eclogite (Omphacite + Almandine-Pyrope Garnet)
metamorphic
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Hand-Drawn Trading Card (Amateur Artwork)
Cellulose-based substrate with wax/graphite/ink deposit (n/a for minerals)
Organic/Synthetic Composite (Paper and Pigment)
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Sandstone (Greywacke/Lithic Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Stromatolite
Biogenic Sedimentary Rock (Lithified microbial mat)
sedimentary
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Basalt with Quartz Veins
Amygdaloidal Basalt (matrix) with Crystalline SiO2 (veins)
igneous
Snowflake Obsidian (or similar porphyritic volcanic rock)
Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)
igneous
Granite
Granite (Felsic Plutonic Rock)
Igneous
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Garnet Schist or Garnet-bearing Quartzite
Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)
metamorphic
Chert (Quartz Variety)
Chert (mostly SiO2 / Silicon Dioxide)
sedimentary
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Felsic Igneous Rock (likely Rhyolite or weathered Granite)
Felsic Volcanic/Plutonic Rock
igneous
Chert (Nodular)
Microcrystalline Silica (SiO2)
sedimentary
Druzy Quartz (on Quartzite or Chert)
Silicon Dioxide (SiO2)
mineral
Turquoise in Matrix
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossilized Brachiopod/Bivalve in Limestone
Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)
sedimentary
Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Porphyritic Basalt (Chinese Writing Stone)
Porphyritic Basalt or Porphyritic Andesite
igneous
Sandstone
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chalcedony
Silicon Dioxide (SiO2)
mineral
Arkosic Sandstone
Arkose (Clastic Sedimentary Rock)
sedimentary
Eclogite
Eclogite (comprising Omphacite and Garnet)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite with Iron Staining
Quartzite (primarily SiO2 with Fe2O3 staining)
metamorphic
Quartzite (Iron-stained)
Quartzite (SiO2 with Fe-oxides)
metamorphic
Granodiorite / Granite
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Limestone (Brecciated/Recrystallized)
Calcium Carbonate (CaCO3)
sedimentary
Scoria
Scoria (a vesicular basalt or andesite)
igneous
Granite
Granite (phaneritic felsic intrusive rock)
igneous
Basalt
Mafic volcanic rock (consisting mostly of plagioclase, pyroxene, and olivine)
igneous