Ruby (Raw Corundum)
Alumina (Al2O3) with Chromium traces
gemstone
Category
Mineral (Refined Metal)
Browse mineral (refined metal) specimens identified by the Rock Identifier community.
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Goethite / Limonite Concretion
Iron Hydroxide Oxide (FeO(OH))
sedimentary
Pyrite in Slate
Iron Disulfide (FeS2) in Low-grade Metamorphic Rock
metamorphic
Basalt (Vesicular)
Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene
igneous
Basalt
Basalt
igneous
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
metamorphic
Quartz with Magnetite or Schorl inclusion
Silicon Dioxide (SiO2) with Fe3O4 or NaFe3(Al6)(BO3)3Si6O18(OH)4
metamorphic
Ironstone Concretion
Ferruginous Concretion
sedimentary
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Moqui Marble
Iron Oxide Concretion (Limonite/Hematite shell with Sandstone core)
sedimentary
Metallic sulfide ore, likely pyrite-bearing rock
Pyrite (FeS₂), possibly with chalcopyrite and quartz/host rock
mineral
Black Beauty Meteorite
NWA 7034 (Northwest Africa 7034)
igneous
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite-Hematite-Chert)
sedimentary
Schist (Garnet-Mica Schist)
Garnet-Mica Schist
metamorphic
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Basalt
Basalt (Aphanitic mafic volcanic rock)
igneous
Cleavable Calcite
Calcium Carbonate (CaCO3)
mineral
Botryoidal Goethite
Goethite (α-Fe3+O(OH))
mineral
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheets with Quartz)
metamorphic
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Celestine (Celestite)
Strontium sulfate (SrSO4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2 mixed with SiO2)
metamorphic
Garnet Amphibolite (or Garnet Gneiss)
Garnet amphibolite / Garnet-bearing metamorphic rock
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
sedimentary
Mica Schist
Schist (muscovite-biotite schist)
metamorphic
Galena
Galena (lead sulfide, PbS)
mineral
Possible flint or slag fragment
Microcrystalline quartz (chalcedony), or iron-rich industrial slag
mineral
Polished blue sodalite cabochons
Sodalite, Na₈Al₆Si₆O₂₄Cl₂
mineral
Yellow Aventurine
Silicon Dioxide (SiO2) with inclusions
mineral
Quartz with Mica inclusions
Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions
mineral
Dendritic Agate (River Pebble)
Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
![Arfvedsonite in Quartz (Arfvedsonite [Na3(Fe2+4Fe3+)Si8O22(OH)2] often hosted in Quartz or Feldspar) — igneous](https://media.rockidentification.com/5af4c6b0-6733-4f77-a6ae-987848327128-thumbnail.jpg)
Arfvedsonite in Quartz
Arfvedsonite [Na3(Fe2+4Fe3+)Si8O22(OH)2] often hosted in Quartz or Feldspar
igneous