Rock Identifier

Community gallery

All rocks & minerals

Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.

Chert (Jasper variation) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper variation)

Silicon Dioxide (SiO2)

sedimentary
Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Blue Lace Agate (Chert/Chalcedony) (Silicon dioxide (SiO2)) — mineral

Blue Lace Agate (Chert/Chalcedony)

Silicon dioxide (SiO2)

mineral
Chalcedony Geode Fragment (Botryoidal) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Chalcedony Geode Fragment (Botryoidal)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

mineral
Moldavite (Tektite (Amorphous Silica, SiO2 + Al2O3)) — mineral

Moldavite

Tektite (Amorphous Silica, SiO2 + Al2O3)

mineral
Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

sedimentary
Yellow Ocherous Siltstone (Limonitic Shale) (Limonitic Siltstone / Goethite-rich Sedimentary Rock) — sedimentary

Yellow Ocherous Siltstone (Limonitic Shale)

Limonitic Siltstone / Goethite-rich Sedimentary Rock

sedimentary
Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

sedimentary
Black Onyx (Cryptocrystalline Quartz (SiO2)) — mineral

Black Onyx

Cryptocrystalline Quartz (SiO2)

mineral
Granodiorite (Granodiorite (Intermediate plutonic rock)) — igneous

Granodiorite

Granodiorite (Intermediate plutonic rock)

igneous
Iron-stained Quartz (Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions) — mineral

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Limonite/Goethite) inclusions

mineral
Muscovite Mica (Muscovite - KAl2(AlSi3O10)(OH)2) — mineral

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)

sedimentary
Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Sapphire (Corundum (Al2O3)) — mineral

Sapphire

Corundum (Al2O3)

mineral
Cubic Zirconia (as a jewelry specimen) (Zirconium dioxide (ZrO2)) — mineral

Cubic Zirconia (as a jewelry specimen)

Zirconium dioxide (ZrO2)

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

Rose Quartz

Silicon Dioxide (SiO2)

mineral
Amethyst (Silicon Dioxide with iron impurities (SiO2)) — mineral

Amethyst

Silicon Dioxide with iron impurities (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral
Black Tourmaline (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

mineral
Tiger's Eye, Hematite, and Black Obsidian Bracelet (SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)) — mineral

Tiger's Eye, Hematite, and Black Obsidian Bracelet

SiO2 (Tiger's Eye), Fe2O3 (Hematite), and 70-75% SiO2 (Obsidian)

mineral
Amethyst (Quartz (Silicon Dioxide with iron impurities) - SiO2) — mineral

Amethyst

Quartz (Silicon Dioxide with iron impurities) - SiO2

mineral
Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

metamorphic
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

metamorphic
Quartzite pebble (Quartzite (SiO2)) — metamorphic

Quartzite pebble

Quartzite (SiO2)

metamorphic
Unakite Gneiss (Metasomatic Granitoid (variety Unakite)) — metamorphic

Unakite Gneiss

Metasomatic Granitoid (variety Unakite)

metamorphic
River Stone (possibly Gneiss) (Metamorphic Gneiss) — metamorphic

River Stone (possibly Gneiss)

Metamorphic Gneiss

metamorphic
Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

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

Jasper

Silicon Dioxide (SiO2) with impurities

sedimentary
Granite Pebble (Felsic Intrusive Igneous Rock) — igneous

Granite Pebble

Felsic Intrusive Igneous Rock

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

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

metamorphic
Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

mineral
Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

mineral
Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

sedimentary
Pyritic Sandstone (Clastic Sedimentary Rock (Pyrite-bearing Sandstone)) — sedimentary

Pyritic Sandstone

Clastic Sedimentary Rock (Pyrite-bearing Sandstone)

sedimentary
Granite (Granite) — igneous

Granite

Granite

igneous
Quartzite (Ferruginous) (Metamorphosed Quartz Sandstone (SiO2 with Iron oxide staining)) — metamorphic

Quartzite (Ferruginous)

Metamorphosed Quartz Sandstone (SiO2 with Iron oxide staining)

metamorphic
Yellow Jasper (Silicon Dioxide (SiO2) with iron inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

sedimentary
Chert (Yellow Jasper/Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

sedimentary