Rock Identifier

Category

Mineral (Processed Alloy)

Browse mineral (processed alloy) specimens identified by the Rock Identifier community.

Uncertain fine-grained rock or mineral-bearing specimen (Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains) — mineral

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Unidentified dark mineral or rock specimen (Indeterminate from the severely blurred image; possible dark igneous rock or opaque mineral) — mineral

Unidentified dark mineral or rock specimen

Indeterminate from the severely blurred image; possible dark igneous rock or opaque mineral

Indeterminate metallic mineral fragments (Possibly pyrite, chalcopyrite, or metallic sulfide-bearing rock) — mineral

Indeterminate metallic mineral fragments

Possibly pyrite, chalcopyrite, or metallic sulfide-bearing rock

Blue Calcite (Calcium Carbonate (CaCO3)) — mineral

Blue Calcite

Calcium Carbonate (CaCO3)

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Blue Tiger's Eye (Silicified Riebeckite (SiO2)) — mineral

Blue Tiger's Eye

Silicified Riebeckite (SiO2)

Rhodonite (Rhodonite (Mn2+SiO3)) — mineral

Rhodonite

Rhodonite (Mn2+SiO3)

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

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Iron Ore (Magnetite-Hematite) (Magnetite (Fe3O4) and Hematite (Fe2O3)) — mineral

Iron Ore (Magnetite-Hematite)

Magnetite (Fe3O4) and Hematite (Fe2O3)

River Stone / Pebble (Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)) — Mineral, Sediment

River Stone / Pebble

Clastic Sediment (composed largely of Quartz, Feldspar, and various rock fragments)

Mineral, Sediment

Pink Granite (Granite (High K-Feldspar variety)) — igneous

Pink Granite

Granite (High K-Feldspar variety)

Iron-rich concretion or weathered ironstone (Limonite/goethite-rich ironstone; commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)) — sedimentary

Iron-rich concretion or weathered ironstone

Limonite/goethite-rich ironstone; commonly approximated as hydrated iron oxides (FeO(OH)·nH₂O)

Petrified Wood (Silicified Wood (primarily SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone River Cobble (Arenite (predominantly SiO2)) — sedimentary

Sandstone River Cobble

Arenite (predominantly SiO2)

Fossilized Shark Tooth (Chondrichthyes (Class)) — fossil

Fossilized Shark Tooth

Chondrichthyes (Class)

Ferruginous Quartz (Hematoid Quartz) (Silicon Dioxide (SiO2) with Hematite or Goethite inclusions) — mineral

Ferruginous Quartz (Hematoid Quartz)

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Banded fluorite point (Fluorite (calcium fluoride, CaF₂)) — mineral

Banded fluorite point

Fluorite (calcium fluoride, CaF₂)

Sapphirine in Matrix (Sapphirine (Mg,Al)8(Al,Si)6O20) — mineral

Sapphirine in Matrix

Sapphirine (Mg,Al)8(Al,Si)6O20

Dinosaur Claw Fossil (Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)) — fossil

Dinosaur Claw Fossil

Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)

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

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Tumbled brown translucent mineral fragment (Indeterminate; possibly quartz/chalcedony or weathered feldspar) — mineral

Tumbled brown translucent mineral fragment

Indeterminate; possibly quartz/chalcedony or weathered feldspar

Tiny rounded brown mineral grain (Indeterminate; possibly iron oxide, garnet, or a weathered sulfide grain) — mineral

Tiny rounded brown mineral grain

Indeterminate; possibly iron oxide, garnet, or a weathered sulfide grain

Iron-rich Gossan with Quartz (Limonite and Goethite with Silicon Dioxide (SiO2)) — sedimentary

Iron-rich Gossan with Quartz

Limonite and Goethite with Silicon Dioxide (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Hematite / Red Ochre (Iron Ore) (Hematite (Fe2O3)) — mineral

Hematite / Red Ochre (Iron Ore)

Hematite (Fe2O3)

Fossilized Shell (Invertebrate fossil (Bivalvia or Brachiopoda)) — fossil

Fossilized Shell

Invertebrate fossil (Bivalvia or Brachiopoda)

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Celestite (Celestine) (Strontium sulfate (SrSO4)) — mineral

Celestite (Celestine)

Strontium sulfate (SrSO4)

Prehnite (Calcium aluminum silicate hydroxide - Ca2Al(AlSi3O10)(OH)2) — mineral

Prehnite

Calcium aluminum silicate hydroxide - Ca2Al(AlSi3O10)(OH)2

Green Aventurine (Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)) — mineral

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Fossilized Gastropod Shell (Class Gastropoda (Fossil)) — sedimentary

Fossilized Gastropod Shell

Class Gastropoda (Fossil)

Zebra Jasper (Tektite variety of Silicon Dioxide (SiO2) with inclusions) — sedimentary

Zebra Jasper

Tektite variety of Silicon Dioxide (SiO2) with inclusions

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Tiger's Eye (Rough) (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2)

Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Calcite

Calcite (Calcium Carbonate, CaCO3)

Sandstone (likely Calcareous or Micaceous) (Clastic sedimentary rock (primarily Quartz with Cementing Agents)) — sedimentary

Sandstone (likely Calcareous or Micaceous)

Clastic sedimentary rock (primarily Quartz with Cementing Agents)

Mica schist (Mica schist (Muscovite and Biotite group)) — metamorphic

Mica schist

Mica schist (Muscovite and Biotite group)

Asphalt Concrete (Bituminous Conglomerate) (Anthropogenic Bituminous Conglomerate) — sedimentary

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

Specular Hematite (Specularite) in Matrix (Specularite (Fe2O3)) — mineral

Specular Hematite (Specularite) in Matrix

Specularite (Fe2O3)

$Black Tourmaline (Schorl (Na(Fe2+)_{3}Al_{6} (BO_{3})_{3} (Si_{6}O_{18})(OH)_{4})) — Mineral$

Black Tourmaline

Schorl (Na(Fe2+)_{3}Al_{6} (BO_{3})_{3} (Si_{6}O_{18})(OH)_{4})