Rock Identifier

Category

Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)

Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.

Granodiorite (Granodiorite (Na,Ca)(Al,Si)4O8) — igneous

Granodiorite

Granodiorite (Na,Ca)(Al,Si)4O8

igneous
Ruby (Corundum (Al2O3:Cr)) — mineral

Ruby

Corundum (Al2O3:Cr)

mineral
Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

mineral
Dumortierite Quartz (Blue Quartz) (Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)) — mineral

Dumortierite Quartz (Blue Quartz)

Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)

mineral
Limestone (CaCO3 (principally Calcite)) — sedimentary

Limestone

CaCO3 (principally Calcite)

sedimentary
Granitic Gravel Piece (Granite (Felsic Plutonic Rock / SiO2 with Al2O3, K2O, Na2O)) — igneous

Granitic Gravel Piece

Granite (Felsic Plutonic Rock / SiO2 with Al2O3, K2O, Na2O)

igneous
Raw Diamond (Diamond (pure Carbon, C)) — mineral

Raw Diamond

Diamond (pure Carbon, C)

mineral
Agate (Dyed High-Grade Polished Slice) (Silicon dioxide (SiO2), Chalcedony crystal variety) — mineral

Agate (Dyed High-Grade Polished Slice)

Silicon dioxide (SiO2), Chalcedony crystal variety

mineral
Quartzite (Quartzite (principally SiO2)) — metamorphic

Quartzite

Quartzite (principally SiO2)

metamorphic
Garnet (likely Almandine or Pyrope) (Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)) — mineral

Garnet (likely Almandine or Pyrope)

Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)

mineral
Corundum (Corundum (Al2O3)) — Mineral

Corundum

Corundum (Al2O3)

Mineral
Red Jasper (Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)) — mineral

Red Jasper

Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)

mineral
Diamond (Diamond (pure carbon; C)) — Mineral

Diamond

Diamond (pure carbon; C)

Mineral
Amethyst (variety of Quartz) (SiO2 (Silicon Dioxide)) — Mineral

Amethyst (variety of Quartz)

SiO2 (Silicon Dioxide)

Mineral
Sandstone (Sandstone (clastic sedimentary rock)) — Rock

Sandstone

Sandstone (clastic sedimentary rock)

Rock
Green Calcite (Calcium Carbonate (CaCO3)) — mineral

Green Calcite

Calcium Carbonate (CaCO3)

mineral
Greenschist (Chlorite schist) — metamorphic

Greenschist

Chlorite schist

metamorphic
Chert (Jasper/Flint variant) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

sedimentary
Vesicular Rhyolite (Extrusive igneous rock (high-silica rhyolite)) — igneous

Vesicular Rhyolite

Extrusive igneous rock (high-silica rhyolite)

igneous
Muscovite Schist (Muscovite (KAl2(AlSi3O10)(OH)2) in Schist) — metamorphic

Muscovite Schist

Muscovite (KAl2(AlSi3O10)(OH)2) in Schist

metamorphic
Diamond (Diamond (C)) — Mineral

Diamond

Diamond (C)

Mineral
Sapphire (Corundum variety) (Sapphire (Al₂O₃)) — Mineral

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Mineral
Agate (Beads) (Silicon Dioxide (SiO2)) — mineral

Agate (Beads)

Silicon Dioxide (SiO2)

mineral
Garnet-Bearing Gneiss (Almandine-Garnet Gneiss) — metamorphic

Garnet-Bearing Gneiss

Almandine-Garnet Gneiss

metamorphic
Pyrite (Pyrite (FeS₂)) — Mineral

Pyrite

Pyrite (FeS₂)

Mineral
Diamond (Diamond (C)) — Mineral

Diamond

Diamond (C)

Mineral
Red Shale (Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)) — sedimentary

Red Shale

Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)

sedimentary
Diamond (Uncut Crystal) (Carbon (C)) — mineral

Diamond (Uncut Crystal)

Carbon (C)

mineral
Banded Agate (often called Brown Agate or Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Banded Agate (often called Brown Agate or Chalcedony)

Silicon Dioxide (SiO2)

mineral
Graphite (Graphite (Native Carbon, C)) — metamorphic

Graphite

Graphite (Native Carbon, C)

metamorphic
Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

mineral
Diamond (Colorless/White) (Carbon (C)) — mineral

Diamond (Colorless/White)

Carbon (C)

mineral
Basalt with Desert Varnish (Mafic Volcanic Rock (Fe/Mg rich Silicate)) — igneous

Basalt with Desert Varnish

Mafic Volcanic Rock (Fe/Mg rich Silicate)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Marble (Recrystallized Calcite (CaCO3) Rock) — metamorphic

Marble

Recrystallized Calcite (CaCO3) Rock

metamorphic
Shale or Siltstone (Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)) — sedimentary

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

sedimentary
Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

mineral
Red Jasper (Mahogany Obsidian variant similarity) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper (Mahogany Obsidian variant similarity)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary
Orange Calcite (Calcite (CaCO3)) — Mineral

Orange Calcite

Calcite (CaCO3)

Mineral
Marble (Recrystallized Limestone (CaCO3)) — metamorphic

Marble

Recrystallized Limestone (CaCO3)

metamorphic
Sandstone Chert/Quartzite (Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite) — sedimentary

Sandstone Chert/Quartzite

Silicon Dioxide (SiO2) - Sedimentary Sandstone / Orthoquartzite

sedimentary
Chalcedony (Common Opal/Chert variety) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Common Opal/Chert variety)

Silicon Dioxide (SiO2)

mineral