Rock Identifier

Category

Mineral (Primary Constituent)

Browse mineral (primary constituent) specimens identified by the Rock Identifier community.

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

mineral
Bauxite (Bauxite (Al2O3·2H2O)) — sedimentary

Bauxite

Bauxite (Al2O3·2H2O)

sedimentary
Vuggy Quartz on Matrix (Crystalline Silicon Dioxide (SiO2)) — mineral

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

mineral
Granite (Orthoclase rich) (Granite (composed primarily of Quartz and Potassium Feldspar KAlSi3O8)) — igneous

Granite (Orthoclase rich)

Granite (composed primarily of Quartz and Potassium Feldspar KAlSi3O8)

igneous
Sandstone (Arenite) — sedimentary

Sandstone

Arenite

sedimentary
Amygdaloidal Basalt (Amygdaloidal Basalt (Mafic volcanic rock)) — igneous

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

igneous
Pink Granite (Phaneritic Felsic Igneous Rock (Granite)) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

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

Quartz (Milky Quartz Pebble)

Silicon Dioxide (SiO2)

mineral
Botryoidal Malachite (Malachite - Cu2CO3(OH)2) — mineral

Botryoidal Malachite

Malachite - Cu2CO3(OH)2

mineral
Ocean Jasper (Spherulitic Chalcedony (SiO2)) — sedimentary

Ocean Jasper

Spherulitic Chalcedony (SiO2)

sedimentary
Hematite (Tumbled) (Iron(III) oxide (Fe2O3)) — mineral

Hematite (Tumbled)

Iron(III) oxide (Fe2O3)

mineral
Amber Inlay Jewelry (Fossilized Resin (C10H16O)) — Organic Gemstone (Biogenic)

Amber Inlay Jewelry

Fossilized Resin (C10H16O)

Organic Gemstone (Biogenic)
Hematite Nodular Concretion (Iron(III) oxide (Fe2O3)) — mineral

Hematite Nodular Concretion

Iron(III) oxide (Fe2O3)

mineral
Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

mineral
Quartz (Microcrystalline Gravel) (Silicon Dioxide (SiO2)) — mineral

Quartz (Microcrystalline Gravel)

Silicon Dioxide (SiO2)

mineral
Magnetite / Hematite rich ore (Magnetite (Fe3O4) or Hematite (Fe2O3)) — mineral

Magnetite / Hematite rich ore

Magnetite (Fe3O4) or Hematite (Fe2O3)

mineral
Turquoise color-bead and Hematite necklace (Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)) — mineral

Turquoise color-bead and Hematite necklace

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

mineral
Pearl (Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)) — mineral

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

mineral
Peridot (Olivine) (Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)) — mineral

Peridot (Olivine)

Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)

mineral
Beryl (likely Emerald or Aquamarine in matrix) (Beryllium aluminum silicate (Be3Al2Si6O18)) — mineral

Beryl (likely Emerald or Aquamarine in matrix)

Beryllium aluminum silicate (Be3Al2Si6O18)

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

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Mineral
Bloodstone (Heliotrope) (Silicon Dioxide (SiO2) with iron silicate and iron oxide inclusions) — Mineral

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with iron silicate and iron oxide inclusions

Mineral
Gold Ore in Matrix (Native Gold (Au) in Quartz/Limonite host rock) — mineral

Gold Ore in Matrix

Native Gold (Au) in Quartz/Limonite host rock

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

Gold Nugget

Native Gold (Au)

mineral
Garnet and Quartz (Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)) — mineral

Garnet and Quartz

Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)

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

Blue Chalcedony (likely dyed)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

mineral
Pearl (incorporated into jewelry) (Aragonite and Calcite (CaCO3)) — mineral

Pearl (incorporated into jewelry)

Aragonite and Calcite (CaCO3)

mineral
Ferruginous Quartz (Silicon Dioxide (SiO2) with Hematite/Limonite (Fe2O3·nH2O) inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite (Fe2O3·nH2O) inclusions

mineral
Lapis Lazuli (Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite and other associated minerals)) — metamorphic

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2 (Lazurite and other associated minerals)

metamorphic
Sandstone (River Pebble) (Arenite (primarily SiO2)) — sedimentary

Sandstone (River Pebble)

Arenite (primarily SiO2)

sedimentary
Ironstone (with possible Hematite/Limonite coating) (Ironstone (Fe-rich sedimentary rock)) — sedimentary

Ironstone (with possible Hematite/Limonite coating)

Ironstone (Fe-rich sedimentary rock)

sedimentary
Rough Sapphire (Corundum) (Corundum (Al2O3)) — mineral

Rough Sapphire (Corundum)

Corundum (Al2O3)

mineral
Banded Agate (Chalcedony (SiO2) with microcrystalline quartz) — mineral

Banded Agate

Chalcedony (SiO2) with microcrystalline quartz

mineral
Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

mineral
Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

mineral
Gold in Quartz Matrix (Native Gold (Au) in Quartz (SiO2)) — mineral

Gold in Quartz Matrix

Native Gold (Au) in Quartz (SiO2)

mineral
Peridot (Olivine) (Magnesium Iron Silicate (Mg, Fe)2SiO4) — mineral

Peridot (Olivine)

Magnesium Iron Silicate (Mg, Fe)2SiO4

mineral
Gold Ore in Matrix (Native Gold (Au) in Quartz/Host Rock) — mineral

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

mineral
Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

mineral
Moonstone (specifically White Moonstone or Girasol Quartz) (Potassium aluminum silicate (KAlSi3O8)) — mineral

Moonstone (specifically White Moonstone or Girasol Quartz)

Potassium aluminum silicate (KAlSi3O8)

mineral
Pink Opal (Hydrated silicon dioxide (SiO2·nH2O) with inclusions) — mineral

Pink Opal

Hydrated silicon dioxide (SiO2·nH2O) with inclusions

mineral
Amethyst (Amethyst (variety of Quartz, SiO2)) — mineral

Amethyst

Amethyst (variety of Quartz, SiO2)

mineral