Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Corundum (Sapphire) (Corundum (Al2O3)) — mineral

Corundum (Sapphire)

Corundum (Al2O3)

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

Rose Quartz

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

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Shungite (Non-crystalline carbon (high-carbon metamorphic rock)) — metamorphic

Shungite

Non-crystalline carbon (high-carbon metamorphic rock)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartzite (Quartzite) — metamorphic

Quartzite

Quartzite

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered sandstone cobble (Clastic sandstone, likely quartz-rich arenite or arkose) — sedimentary

Weathered sandstone cobble

Clastic sandstone, likely quartz-rich arenite or arkose

Blue Chalcedony (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Conglomerate (Clastic Sedimentary Conglomerate (SiO2, CaCO3, etc.)) — sedimentary

Conglomerate

Clastic Sedimentary Conglomerate (SiO2, CaCO3, etc.)

Pumice (Pumice (a highly vesicular amorphous volcanic glass)) — igneous

Pumice

Pumice (a highly vesicular amorphous volcanic glass)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Aqua Aura Quartz (Titanium/Gold-coated Silicon Dioxide (SiO2)) — mineral

Aqua Aura Quartz

Titanium/Gold-coated Silicon Dioxide (SiO2)

Limonite Pseudomorph after Pyrite (Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)) — mineral

Limonite Pseudomorph after Pyrite

Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)

Pink Dyed Agate (Banded Chalcedony) (Silicon dioxide (SiO2) - variety Chalcedony) — mineral

Pink Dyed Agate (Banded Chalcedony)

Silicon dioxide (SiO2) - variety Chalcedony

Quartzite (Silica (SiO2) quartzite) — metamorphic

Quartzite

Silica (SiO2) quartzite

Quartzite (Metamorphic rock (SiO2)) — metamorphic

Quartzite

Metamorphic rock (SiO2)

Citrine (Silicon Dioxide (SiO2)) — gemstone

Citrine

Silicon Dioxide (SiO2)

Chert (specifically tan/pink variety) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically tan/pink variety)

Silicon Dioxide (SiO2)

Yellow Jasper (Chalcedony (SiO2) with iron inclusions) — sedimentary

Yellow Jasper

Chalcedony (SiO2) with iron inclusions

Banded Agate (Onyx type) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Banded Agate (Onyx type)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Carnelian Beads (Silicon Dioxide (Variety of Chalcedony), $SiO_2$) — gemstone

Carnelian Beads

Silicon Dioxide (Variety of Chalcedony), $SiO_2$

Ironstone Concretion / Limonite Node (Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)) — sedimentary

Ironstone Concretion / Limonite Node

Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)

Limonite (Iron Ore) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Blue Sapphire (Ceylon) (Corundum (Al2O3) with traces of Iron and Titanium) — mineral

Blue Sapphire (Ceylon)

Corundum (Al2O3) with traces of Iron and Titanium

Rough Dark Green Sapphire (Corundum (Al2O3)) — mineral

Rough Dark Green Sapphire

Corundum (Al2O3)

Black Garnet (Melanite) (Andradite, Ca3Fe2(SiO4)3) — mineral

Black Garnet (Melanite)

Andradite, Ca3Fe2(SiO4)3

Polished Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Polished Chert (Flint)

Silicon Dioxide (SiO2)

Moqui Marble (Iron Oxide Concretion (Limonite/Hematite over Sandstone)) — sedimentary

Moqui Marble

Iron Oxide Concretion (Limonite/Hematite over Sandstone)

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

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Common Chert node) (Silicon Dioxide (SiO2)) — sedimentary

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

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

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Asphalt (Aggregate) (Bituminous macadam / Concrete Aggregate) — sedimentary

Asphalt (Aggregate)

Bituminous macadam / Concrete Aggregate

Dyed Agate Geode (Pink/Magenta) (Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz) — mineral

Dyed Agate Geode (Pink/Magenta)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Banded Quartzite or Gneissic Pebble (Quartzite with mafic inclusions (SiO2) or Banded Gneiss) — metamorphic

Banded Quartzite or Gneissic Pebble

Quartzite with mafic inclusions (SiO2) or Banded Gneiss

Natural Freshwater Pearl (Calcium Carbonate (Aragonite and Calcite), CaCO3) — gemstone

Natural Freshwater Pearl

Calcium Carbonate (Aragonite and Calcite), CaCO3

Red Jasper (Silicon Dioxide (SiO2) with impure Iron oxides) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with impure Iron oxides

Quartz (Citrine) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine)

Silicon Dioxide (SiO2)