Rock Identifier

Category

Mineral (Primary Constituent)

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

Learn about Mineral (Primary Constituent) in the encyclopedia

Coal

Priday Plume Agate

Pegmatite (Graphic Granite / Granite Pegmatite) (Coarse-grained intrusive igneous rock (Felsic)) — igneous

Pegmatite (Graphic Granite / Granite Pegmatite)

Coarse-grained intrusive igneous rock (Felsic)

Diamond (Diamond (Pure Carbon - C)) — mineral

Diamond

Diamond (Pure Carbon - C)

Diamond (Diamond (C)) — mineral

Diamond

Diamond (C)

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Copper Ore with Chrysocolla/Malachite (Hydrated copper phyllosilicate (Chrysocolla) / Copper carbonate hydroxide (Malachite)) — mineral

Copper Ore with Chrysocolla/Malachite

Hydrated copper phyllosilicate (Chrysocolla) / Copper carbonate hydroxide (Malachite)

Magnetite (Lodestone) (Magnetite (Fe3O4)) — mineral

Magnetite (Lodestone)

Magnetite (Fe3O4)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Diamond (in jewelry) (Carbon (C)) — mineral

Diamond (in jewelry)

Carbon (C)

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

Malachite and Azurite on Matrix

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

Purpurite (Manganese Iron Phosphate, Mn3+(PO4)) — mineral

Purpurite

Manganese Iron Phosphate, Mn3+(PO4)

Chrysocolla (Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)) — mineral

Chrysocolla

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

Chrysocolla in Matrix (Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)) — mineral

Chrysocolla in Matrix

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

Limonite / Ironstone (Hydrated Iron Oxide (FeO(OH)·nH2O)) — mineral

Limonite / Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O)

Bauxite (Bauxite (Al(OH)3, AlO(OH))) — sedimentary

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Diamond (Diamond (pure Carbon, C)) — mineral

Diamond

Diamond (pure Carbon, C)

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Pebble (likely Quartz or Chert) (SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.) — Sedimentary Rock

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Sedimentary Rock

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

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Quartz-bearing weathered rock, possibly quartzite or quartz vein fragment (Quartz (SiO₂), with iron-oxide staining and likely feldspathic impurities) — metamorphic

Quartz-bearing weathered rock, possibly quartzite or quartz vein fragment

Quartz (SiO₂), with iron-oxide staining and likely feldspathic impurities

Sea Shell Fragment (Calcium Carbonate) (Aragonite / Calcite (CaCO3)) — mineral

Sea Shell Fragment (Calcium Carbonate)

Aragonite / Calcite (CaCO3)

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

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Glauconitic Sandstone (Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)) — sedimentary

Glauconitic Sandstone

Glauconitic Sandstone (contains (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Chalcopyrite (Copper iron sulfide (CuFeS2)) — mineral

Chalcopyrite

Copper iron sulfide (CuFeS2)

Bauxite (Bauxite (Al(OH)3, AlO(OH))) — sedimentary

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Diamond (Cut Gemstones in Jewelry) (Carbon (C)) — gemstone

Diamond (Cut Gemstones in Jewelry)

Carbon (C)

Calcite on Limestone (Calcium Carbonate (CaCO3) on Sedimentary Rock) — mineral

Calcite on Limestone

Calcium Carbonate (CaCO3) on Sedimentary Rock

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Milky Quartz (river pebble)

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Larvikite (polished/tumbled) (Larvikite, a monzonitic alkaline intrusive rock; mainly alkali feldspar, plagioclase, and augite/other pyroxenes) — igneous

Larvikite (polished/tumbled)

Larvikite, a monzonitic alkaline intrusive rock; mainly alkali feldspar, plagioclase, and augite/other pyroxenes

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

Hematite

Iron(III) oxide (Fe2O3)

Tumbled rose quartz (Quartz, silicon dioxide (SiO₂), pink variety) — mineral

Tumbled rose quartz

Quartz, silicon dioxide (SiO₂), pink variety

Copper Ore (Malachite and Azurite stained rock) (Cupriferous rock containing secondary copper carbonates) — mineral

Copper Ore (Malachite and Azurite stained rock)

Cupriferous rock containing secondary copper carbonates

Limonite (Limonitic Sandstone) (Hydrated Iron(III) Oxide-Hydroxide ($FeO(OH)·nH_2O$)) — sedimentary

Limonite (Limonitic Sandstone)

Hydrated Iron(III) Oxide-Hydroxide ($FeO(OH)·nH_2O$)

Limonite/Goethite Concretion (Limonite (FeO(OH)nH2O) or Goethite (̑-FeO(OH))) — sedimentary

Limonite/Goethite Concretion

Limonite (FeO(OH)nH2O) or Goethite (̑-FeO(OH))

Olivine (Peridot) ((Mg,Fe)2SiO4) — mineral

Olivine (Peridot)

(Mg,Fe)2SiO4

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

Chrysocolla

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

Quartz-rich pegmatite or weathered feldspathic rock (Granite-family pegmatite; likely quartz (SiO₂) with feldspar and mica) — igneous

Quartz-rich pegmatite or weathered feldspathic rock

Granite-family pegmatite; likely quartz (SiO₂) with feldspar and mica