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.

Quartzite (Quartzite (SiO2 silicon dioxide)) — metamorphic

Quartzite

Quartzite (SiO2 silicon dioxide)

Basalt (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Red Quartzite (Quartzite (SiO2)) — metamorphic

Red Quartzite

Quartzite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Garnet Schist (Almandine-mica schist) — metamorphic

Garnet Schist

Almandine-mica schist

Silicon Carbide (Carborundum) (Silicon Carbide (SiC)) — mineral

Silicon Carbide (Carborundum)

Silicon Carbide (SiC)

Quartz Druzy on Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy on Geode Fragment

Silicon Dioxide (SiO2)

Blue Sapphire (Corundum (Al2O3 - Aluminum Oxide)) — mineral

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Yellow Quartzite (River Pebble) (Quartzite (primarily Silicon Dioxide, SiO2)) — metamorphic

Yellow Quartzite (River Pebble)

Quartzite (primarily Silicon Dioxide, SiO2)

Chert (often called Flint when dark) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Chert (Yellow Jasper variant) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Bauxite (Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)) — sedimentary

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Diamond (Diamond (C)) — mineral

Diamond

Diamond (C)

Pegmatite (Pegmatitic Granite) — igneous

Pegmatite

Pegmatitic Granite

Aventurine (likely Green Aventurine) (Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)) — Mineral/Metamorphic Rock

Aventurine (likely Green Aventurine)

Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)

Mineral/Metamorphic Rock

Precious Opal (Hydrated Silica (SiO2·nH2O)) — mineraloid

Precious Opal

Hydrated Silica (SiO2·nH2O)

Chert / Flint (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Orange Quartzite (Tumble-polished) (Quartzite (primarily SiO2)) — metamorphic

Orange Quartzite (Tumble-polished)

Quartzite (primarily SiO2)

Marble (Carrara style) (Recrystallized Calcite-rich Metamorphic Rock (CaCO3)) — metamorphic

Marble (Carrara style)

Recrystallized Calcite-rich Metamorphic Rock (CaCO3)

Chert (Jasper/Agate variety) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Jasper/Agate variety)

Microcrystalline quartz (SiO2)

Chert (often called Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (often called Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Agate (Silicon dioxide (SiO2) - variety Chalcedony) — mineral

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Schorl (Black Tourmaline) in Matrix (Sodium Iron Aluminum Borosilicate Hydroxide (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)) — mineral

Schorl (Black Tourmaline) in Matrix

Sodium Iron Aluminum Borosilicate Hydroxide (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)

Rough Diamond (Diamond (pure carbon / C)) — mineral

Rough Diamond

Diamond (pure carbon / C)

Quartzite (River Cobble) (Quartzite (SiO2 silicon dioxide)) — metamorphic

Quartzite (River Cobble)

Quartzite (SiO2 silicon dioxide)

Corundum (Ruby variety) (Aluminium oxide (Al2O3)) — mineral

Corundum (Ruby variety)

Aluminium oxide (Al2O3)

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

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Ironstone (likely Ferruginous Siltstone/Sandstone) (Ferruginous sedimentary rock (FeOx-rich clastic)) — sedimentary

Ironstone (likely Ferruginous Siltstone/Sandstone)

Ferruginous sedimentary rock (FeOx-rich clastic)

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

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Milky Quartz (Gold-bearing Prospecting Specimen) (Silicon Dioxide (SiO2)) — mineral

Milky Quartz (Gold-bearing Prospecting Specimen)

Silicon Dioxide (SiO2)

Diamond (Faceted Colorless) (Diamond (Pure Carbon, C)) — mineral

Diamond (Faceted Colorless)

Diamond (Pure Carbon, C)

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

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Agate (Silicon Dioxide (SiO2)) — mineral

Agate

Silicon Dioxide (SiO2)

Ruby (Corundum (Al2O3 with Chromium traces)) — mineral

Ruby

Corundum (Al2O3 with Chromium traces)

Diamond (C (Carbon)) — mineral

Diamond

C (Carbon)

Quartz (Sand Grain size) (Silicon Dioxide (SiO2)) — mineral

Quartz (Sand Grain size)

Silicon Dioxide (SiO2)

Aragonite (Sputnik habit) (Aragonite (Calcium Carbonate, CaCO3)) — mineral

Aragonite (Sputnik habit)

Aragonite (Calcium Carbonate, CaCO3)

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