Rock Identifier

Category

Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)

Browse man made byproduct (often mistaken for obsidian or emerald) specimens identified by the Rock Identifier community.

Serpentinite (Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

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

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Quartzose) (Arenite (SiO2 based)) — sedimentary

Sandstone (Quartzose)

Arenite (SiO2 based)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

River Cobble (likely Quartzite) (Metamorphosed Sandstone (SiO2)) — metamorphic

River Cobble (likely Quartzite)

Metamorphosed Sandstone (SiO2)

Quartzite with Iron Inclusions (Quartzite (primarily SiO2 with Fe2O3 impurities)) — metamorphic

Quartzite with Iron Inclusions

Quartzite (primarily SiO2 with Fe2O3 impurities)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Jasper (Red Chert) (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper (Red Chert)

Jasper (Silicon Dioxide, SiO2)

Red Jasper (Silicon Dioxide (SiO2)) — sedimentary

Red Jasper

Silicon Dioxide (SiO2)

Porphyry (Porphyritic Basalt/Andesite) — igneous

Porphyry

Porphyritic Basalt/Andesite

Fossilized Crab Carapace (Concretion) (Decapoda (fossil), typically preserved in calcite or siderite concretion) — sedimentary

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Limestone (Calcite (CaCO3)) — sedimentary

Limestone

Calcite (CaCO3)

Green Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Green Jasper

Silicon Dioxide (SiO2) with impurities

Vesicular Basalt (Scoria) (Vesicular Basalt) — igneous

Vesicular Basalt (Scoria)

Vesicular Basalt

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Rhodonite (Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3

Pink Quartz (Inclusion-filled) (Silicon Dioxide (SiO2)) — mineral

Pink Quartz (Inclusion-filled)

Silicon Dioxide (SiO2)

Lavender Quartz (appearing as beads) and Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Lavender Quartz (appearing as beads) and Druzy Quartz

Silicon Dioxide (SiO2)

Sandstone (with minor quartz and possible clay components) (Clastic Sedimentary Rock (SiO2 dominated)) — sedimentary

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)

Sandstone (Fossiliferous) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Fossiliferous)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (specifically Lithic or Quartz Arenite) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (specifically Lithic or Quartz Arenite)

Arenite (composed primarily of SiO2)

Quartzite pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite pebble

Quartzite (primarily SiO2)

Fossilized Coral (Petoskey Stone or Rugose Coral) (Antophyllum (Hexagonaria) or Scleractinia (CaCO3)) — sedimentary

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Serpentinite (Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4) — metamorphic

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Limestone (River Pebble) (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River Pebble)

Sedimentary Calcium Carbonate (CaCO3)

Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Rhodochrosite (Manganese carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese carbonate (MnCO3)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Shale (Fissile mudstone (Shale)) — sedimentary

Shale

Fissile mudstone (Shale)

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz (River Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Kimberlite (Kimberlite (Potassic ultramafic volcanic rock)) — igneous

Kimberlite

Kimberlite (Potassic ultramafic volcanic rock)

Rhodochrosite (Manganese Carbonate (MnCO3)) — mineral

Rhodochrosite

Manganese Carbonate (MnCO3)

Sandstone (likely Red/Brown Sandstone) (Arenite (SiO2 based)) — sedimentary

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Bituminous Coal (Bituminous coal (Carbonaceous sedimentary rock)) — sedimentary

Bituminous Coal

Bituminous coal (Carbonaceous sedimentary rock)

Shale (Fissile Siliciclastic Sedimentary Rock) — sedimentary

Shale

Fissile Siliciclastic Sedimentary Rock

Sandstone (with garnet granules) (Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)) — sedimentary

Sandstone (with garnet granules)

Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)

Jasper (Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)) — sedimentary

Jasper

Jasper (Silica-rich microcrystalline Quartz, SiO2 with Fe2O3 impurities)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)