Rock Identifier

Category

Man Made Object (Metalwork)

Browse man made object (metalwork) specimens identified by the Rock Identifier community.

Ruby (Corundum (Al2O3 with Chromium trace elements)) — mineral

Ruby

Corundum (Al2O3 with Chromium trace elements)

mineral
Scoria (Lava Rock) (Vesicular Basalt / Scoria) — igneous

Scoria (Lava Rock)

Vesicular Basalt / Scoria

igneous
Nephrite Jade (Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2) — metamorphic

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

metamorphic
Rhodonite (Rhodonite (MnSiO3)) — Mineral

Rhodonite

Rhodonite (MnSiO3)

Mineral
Granite (Granite) — Igneous

Granite

Granite

Igneous
Basalt (Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

igneous
Sunstone (Heliolite) (Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)) — mineral

Sunstone (Heliolite)

Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)

mineral
Serpentinite (Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)) — metamorphic

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

metamorphic
Green Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral
Quartz (likely macrocrystalline variety) (Quartz (SiO₂)) — Mineral

Quartz (likely macrocrystalline variety)

Quartz (SiO₂)

Mineral
Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

mineral
Granite (Granite (Alkali feldspar, Plagioclase feldspar, and Quartz)) — igneous

Granite

Granite (Alkali feldspar, Plagioclase feldspar, and Quartz)

igneous
Apache Tear (Obsidian) (Obsidian / Amorphous Volcanic Glass (primarily SiO2)) — igneous

Apache Tear (Obsidian)

Obsidian / Amorphous Volcanic Glass (primarily SiO2)

igneous
River Rock (Quartzite/Chert conglomerate) (Quartzite (SiO2)) — metamorphic

River Rock (Quartzite/Chert conglomerate)

Quartzite (SiO2)

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

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

mineral
Citrine (Silicon Dioxide (SiO2) with iron impurities) — Mineral

Citrine

Silicon Dioxide (SiO2) with iron impurities

Mineral
Diorite (Diorite (Intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous
Banded Chert (Agate-like Flint) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Banded Chert (Agate-like Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Chert (specifically Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (specifically Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary
Granodiorite (Granodiorite) — igneous

Granodiorite

Granodiorite

igneous
Quartzite (Quartzite (mostly SiO2)) — metamorphic

Quartzite

Quartzite (mostly SiO2)

metamorphic
Hag Stone (Perforated Sedimentary Rock (typically Limestone or Sandstone)) — sedimentary

Hag Stone

Perforated Sedimentary Rock (typically Limestone or Sandstone)

sedimentary
Satin Spar (Selenite) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

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

Clear Quartz

Silicon Dioxide (SiO2)

mineral
Chert (specifically Flint) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Flint)

Microcrystalline quartz (SiO2)

sedimentary
Milky Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Geode Fragment

Silicon Dioxide (SiO2)

mineral
Chert (Limestone-based) (Silicon dioxide (SiO2)) — sedimentary

Chert (Limestone-based)

Silicon dioxide (SiO2)

sedimentary
Fossilized Coral (Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)) — sedimentary

Fossilized Coral

Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)

sedimentary
Chert (Chalcedony/Agate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

sedimentary
Moqui Marble (Moqui Ball) (Ironstone Concretion (Goethite/Hematite cemented Sandstone)) — sedimentary

Moqui Marble (Moqui Ball)

Ironstone Concretion (Goethite/Hematite cemented Sandstone)

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

Quartz

Quartz (SiO₂ - Silicon Dioxide)

mineral
Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Yellow Quartzite (Quartzite (SiO2)) — metamorphic

Yellow Quartzite

Quartzite (SiO2)

metamorphic
Quartz (Rock Crystal) (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Mineral
Granite (Granite (Mainly Quartz: SiO2, Feldspar: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)) — igneous

Granite

Granite (Mainly Quartz: SiO2, Feldspar: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)

igneous
Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

mineral
Hag Stone (Calcareous sedimentary rock (often Chert, Flint, or Limestone)) — sedimentary

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

sedimentary
Sandstone (Arenite (composed primarily of Quartz, SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of Quartz, SiO2)

sedimentary
Limonite (with goethite) (Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)) — mineral

Limonite (with goethite)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

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

Chert (Nodule)

Silicon Dioxide (SiO2)

sedimentary