Rock Identifier

Category

Man Made Alloy (Metallic)

Browse man made alloy (metallic) specimens identified by the Rock Identifier community.

Fossiliferous Limestone (Chertified Limestone) (Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)) — sedimentary

Fossiliferous Limestone (Chertified Limestone)

Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Sapphire (Corundum (Al2O3)) — mineral

Sapphire

Corundum (Al2O3)

Quartzite (Iron-stained) (Quartzite (primarily SiO2)) — metamorphic

Quartzite (Iron-stained)

Quartzite (primarily SiO2)

Black Obsidian (Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)) — igneous

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Blue Chalcedony Geode (with Quartz Druzy) (Silicon Dioxide (SiO2) - Microcrystalline variety of Quartz) — mineral

Blue Chalcedony Geode (with Quartz Druzy)

Silicon Dioxide (SiO2) - Microcrystalline variety of Quartz

Amygdaloidal Rhyolite (often called Lake Superior Agate relative) (Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)) — igneous

Amygdaloidal Rhyolite (often called Lake Superior Agate relative)

Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)

Rhodolite Garnet (Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3) — mineral

Rhodolite Garnet

Magnesium Aluminum Silicate; formula: (Mg,Fe)3Al2(SiO4)3

Cavansite (Cavansite (Ca(VO)Si4O10·4H2O)) — mineral

Cavansite

Cavansite (Ca(VO)Si4O10·4H2O)

Quartzite River Cobble (Quartzite (SiO2)) — metamorphic

Quartzite River Cobble

Quartzite (SiO2)

Puddingstone (Gowganda Tillite/Lorrain Quartzite) (Jasper Conglomerate) — sedimentary

Puddingstone (Gowganda Tillite/Lorrain Quartzite)

Jasper Conglomerate

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

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

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

Amethyst (Geode)

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Quartzite-rich Pebble) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (Quartzite-rich Pebble)

Arenite (composed primarily of SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Sandstone (Banded) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Basalt (Basalt) — igneous

Basalt

Basalt

Azurite (Azurite (Cu3(CO3)2(OH)2)) — mineral

Azurite

Azurite (Cu3(CO3)2(OH)2)

Rose Quartz (Pink Quartz (SiO2)) — mineral

Rose Quartz

Pink Quartz (SiO2)

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

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Granite (Granite (Phaneritic Quartz-Feldspar rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar rock)

Alexandrite (Chrysoberyl (BeAl2O4)) — mineral

Alexandrite

Chrysoberyl (BeAl2O4)

Pegmatite with Muscovite (Granitic Pegmatite (KAl2(AlSi3O10)(OH)2)) — igneous

Pegmatite with Muscovite

Granitic Pegmatite (KAl2(AlSi3O10)(OH)2)

Pegmatite with Schorl (Black Tourmaline) and Mica (Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)) — igneous

Pegmatite with Schorl (Black Tourmaline) and Mica

Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)

Star Ruby (Corundum (Al2O3 with chromium and rutile inclusions)) — mineral

Star Ruby

Corundum (Al2O3 with chromium and rutile inclusions)

Granite Pegmatite with Tourmaline and Muscovite (Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))) — igneous

Granite Pegmatite with Tourmaline and Muscovite

Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))

Sandstone (Ferruginous) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Talc (Talc (Mg₃Si₄O₁₀(OH)₂)) — Mineral

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Sandstone (River Rock) (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone (River Rock)

Arenite (composed primarily of SiO2)

Sandstone (Quartz Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Chert Pebble (Jasper variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble (Jasper variant)

Microcrystalline Quartz (SiO2)

Scoria (Vesicular Basalt / Scoriaceous Basalt) — igneous

Scoria

Vesicular Basalt / Scoriaceous Basalt

Yellow Jade (Nephrite or Quartzite variety) (Ca2(Mg,Fe)5Si8O22(OH)2 (Nephrite) / SiO2 (Quartzite variant)) — metamorphic

Yellow Jade (Nephrite or Quartzite variety)

Ca2(Mg,Fe)5Si8O22(OH)2 (Nephrite) / SiO2 (Quartzite variant)

Yellow Jade (Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)) — metamorphic

Yellow Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)

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

Rose Quartz

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

Greywacke (River Slikkenstone) (Greywacke (Impure Sandstone)) — sedimentary

Greywacke (River Slikkenstone)

Greywacke (Impure Sandstone)

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

Jasper

Jasper (Silicon Dioxide, SiO2)

Granite (Phaneritic Plutonic Rock (High Silica content)) — igneous

Granite

Phaneritic Plutonic Rock (High Silica content)

Fancy Jasper (Multicolor Agate/Jasper) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Fancy Jasper (Multicolor Agate/Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Aquamarine with Ruby Accent (Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)) — mineral

Aquamarine with Ruby Accent

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)

Blue Apatite (Apatite - Ca5(PO4)3(F,Cl,OH)) — mineral

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

Fossilized Angel Wing Shell (Cyrtopleura costata) — sedimentary

Fossilized Angel Wing Shell

Cyrtopleura costata