Rock Identifier

Category

Mineral Precipitate (Anthropogenic Context)

Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.

Sandstone (Arenite (Siliclastic sedimentary rock), SiO2 + various minerals) — sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Granitic Pegmatite with Biotite (Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)) — igneous

Granitic Pegmatite with Biotite

Pegmatitic Granite (contains KAlSi3O8, SiO2, K(Mg,Fe)3AlSi3O10(OH)2)

Malachite (Copper carbonate hydroxide [Cu2CO3(OH)2]) — mineral

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

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

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Ferruginous Quartz (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — mineral

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Diorite (Diorite) — igneous

Diorite

Diorite

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

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss) (Gneiss (complex silicate composition)) — metamorphic

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)

Gneiss (complex silicate composition)

Banded Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic Rock)

Collection of Minerals and Ores (Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)) — mineral

Collection of Minerals and Ores

Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)

Pearl (Biogenic Mineral) (Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3) — mineral

Pearl (Biogenic Mineral)

Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3

Pearl (as a Biogenic Mineral) (Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3) — mineral

Pearl (as a Biogenic Mineral)

Calcium Carbonate (mostly Aragonite) with Conchiolin; CaCO3

Granitic Pegmatite (Muscovite and Quartz) (Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)) — igneous

Granitic Pegmatite (Muscovite and Quartz)

Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)

Sandstone (Ferruginous) (Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Ferruginous)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Milky Quartz with Tourmaline and Iron Oxides (Silicon Dioxide (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Milky Quartz with Tourmaline and Iron Oxides

Silicon Dioxide (SiO2) with Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Orthoclase Feldspar (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Orthoclase Feldspar

Potassium Aluminum Silicate (KAlSi3O8)

Green Apophyllite and Stilbite on Quartz Cluster (Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)) — Mineral

Green Apophyllite and Stilbite on Quartz Cluster

Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)

Gabbro (Gabbro (Mafic Plutonic Rock)) — igneous

Gabbro

Gabbro (Mafic Plutonic Rock)

Gneiss (Metamorphic Rock) (Gneiss) — metamorphic

Gneiss (Metamorphic Rock)

Gneiss

Granite (Dioritic variant) (Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite (Dioritic variant)

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Gneiss (Gneiss (High-grade regional metamorphic rock)) — metamorphic

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss (specifically a Granitic Gneiss) (Gneiss (Composition: Quartz, Feldspar, Mica)) — metamorphic

Gneiss (specifically a Granitic Gneiss)

Gneiss (Composition: Quartz, Feldspar, Mica)

Chrysocolla on Limonite Matrix (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) on FeO(OH)·nH2O (Limonite)) — mineral

Chrysocolla on Limonite Matrix

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) on FeO(OH)·nH2O (Limonite)

Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

Turquoise (Dyed Howlite/Magnesite imitation) (CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)) — mineral

Turquoise (Dyed Howlite/Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (Target mineral) / Ca2B5SiO9(OH)5 (Actual specimen: Howlite)

Chrysocolla (Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O) — mineral

Chrysocolla

Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Azurite and Malachite on Matrix (Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)) — mineral

Azurite and Malachite on Matrix

Cu3(CO3)2(OH)2 (Azurite) and Cu2CO3(OH)2 (Malachite)

Blue Howlite (Dyed) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Red Sandstone (Arenite (with Iron Oxide / Hematite staining)) — sedimentary

Red Sandstone

Arenite (with Iron Oxide / Hematite staining)

Selenite (Satin Spar) (Gypsum (CaSO4·2H2O)) — mineral

Selenite (Satin Spar)

Gypsum (CaSO4·2H2O)

Quartz Pebbles (Silicon Dioxide (SiO2)) — mineral

Quartz Pebbles

Silicon Dioxide (SiO2)

Greenstone (Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote) — metamorphic

Greenstone

Protolith of basalt, diabase, or gabbro; often contains minerals like chlorite, actinolite, and epidote

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Chiastolite (Andalusite) (Al2SiO5) — metamorphic

Chiastolite (Andalusite)

Al2SiO5

Hematite (Hematite (Iron(III) oxide, Fe2O3)) — mineral

Hematite

Hematite (Iron(III) oxide, Fe2O3)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Sandstone (with possibly iron oxides and other minerals) (Sandstone) — Sedimentary rock

Sandstone (with possibly iron oxides and other minerals)

Sandstone

Sedimentary rock

Schist (N/A (a rock type, not a mineral formula)) — metamorphic

Schist

N/A (a rock type, not a mineral formula)

Botryoidal Goethite (Goethite (α-Fe3+O(OH))) — mineral

Botryoidal Goethite

Goethite (α-Fe3+O(OH))