Rock Identifier

Category

Mineraloid (Man Made Origin)

Browse mineraloid (man made origin) specimens identified by the Rock Identifier community.

Obsidian (Volcanic glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide with impurities)

Quartzite (Quartzite) — Metamorphic rock

Quartzite

Quartzite

Metamorphic rock

Picture Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

River Pebble (Greywacke or Basaltic) (Massive Greywacke or Basaltic Andesite) — sedimentary or igneous

River Pebble (Greywacke or Basaltic)

Massive Greywacke or Basaltic Andesite

sedimentary or igneous

Granite River Rock (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Granite River Rock

Phaneritic Felsic Igneous Rock (Granite)

Rhodolite Garnet (Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)) — mineral

Rhodolite Garnet

Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)

Red Jasper (Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)) — sedimentary

Red Jasper

Opaque microcrystalline Quartz (SiO2 with Fe2O3 inclusions)

Red Cubic Zirconia (Simulated Garnet) (Zirconium Dioxide (ZrO2)) — mineral

Red Cubic Zirconia (Simulated Garnet)

Zirconium Dioxide (ZrO2)

Olivine (Peridot) (Olivine Group (Mg,Fe)2SiO4) — mineral

Olivine (Peridot)

Olivine Group (Mg,Fe)2SiO4

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 principal component)) — sedimentary

Sandstone

Arenite (SiO2 principal component)

Chalcedony Pebble (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Banded Gneiss (Gneiss (High-grade Regional Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Jadeite (NaAlSi2O6; Jadeite silicate mineral) — metamorphic

Jadeite

NaAlSi2O6; Jadeite silicate mineral

Sandstone (Quartz Sandstone) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartz Sandstone)

Arenite (primarily SiO2)

Jasper-Agate Breccia (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper-Agate Breccia

Silicon Dioxide (SiO2) with iron oxide inclusions

Tiger's Eye (Tiger's Eye (a variety of Chalcedony, which is cryptocrystalline quartz). Chemical Formula: SiO2 with inclusions of crocidolite fibers.) — Mineral

Tiger's Eye

Tiger's Eye (a variety of Chalcedony, which is cryptocrystalline quartz). Chemical Formula: SiO2 with inclusions of crocidolite fibers.

Sandstone Pebble (Arenite (primarily SiO2)) — sedimentary

Sandstone Pebble

Arenite (primarily SiO2)

Coral (Precious Coral) (Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO
3
).) — Mineral, Organic Gemstone

Coral (Precious Coral)

Corallium rubrum (Red Coral), Paracorallium japonicum (Momo Coral), Pleurocorallium elatius (Sardinian Coral), various other species within the Corallidae family. Chemically, it's primarily Calcium Carbonate (CaCO 3 ).

Mineral, Organic Gemstone

Serpentinite (Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Petrified Wood (Silicified wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified wood (primarily SiO2)

Jasper (likely Iron-stained) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Jasper (likely Iron-stained)

Silicon Dioxide (SiO2) with iron oxide inclusions

Fluorite (Calcium Fluoride (CaF2)) — Mineral

Fluorite

Calcium Fluoride (CaF2)

Granite (Phaneritic plutonic rock (Quartz, Feldspar, Mica)) — igneous

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Fluorite (Calcium fluoride (CaF2)) — mineral

Yellow Fluorite

Calcium fluoride (CaF2)

Potassium Feldspar (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar

Orthoclase (KAlSi3O8)

Smoky Quartz Cluster (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz Cluster

Silicon Dioxide (SiO2)

Amygdaloidal Basalt (Basalt with secondary mineral infilling) — igneous

Amygdaloidal Basalt

Basalt with secondary mineral infilling

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Larimar (Blue Pectolite (NaCa2Si3O8(OH))) — mineral

Larimar

Blue Pectolite (NaCa2Si3O8(OH))

Basalt (with possible Calcite/Quartz veining) (Afanitic Mafic Igneous Rock) — igneous

Basalt (with possible Calcite/Quartz veining)

Afanitic Mafic Igneous Rock

Rugose Coral (Horn Coral) (Order Rugosa (extinct fossilized coral)) — sedimentary

Rugose Coral (Horn Coral)

Order Rugosa (extinct fossilized coral)

Milky Quartz (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Sandstone (Ferruginous) (Arenite (primarily SiO2 with Iron Oxide staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide staining)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Potassium Feldspar (Orthoclase (KAlSi3O8)) — mineral

Potassium Feldspar

Orthoclase (KAlSi3O8)

Pink Diamond (Carbon (C)) — mineral

Pink Diamond

Carbon (C)

Basalt with Quartz Veins (Vesicular or aphanitic Basalt with SiO2 (Quartz) intrusions) — Igneous

Basalt with Quartz Veins

Vesicular or aphanitic Basalt with SiO2 (Quartz) intrusions

Red Chert / Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Chert / Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Green Jasper (Jasper (Silicates, SiO2)) — sedimentary

Green Jasper

Jasper (Silicates, SiO2)