Hematite
Iron(III) oxide (Fe2O3)
mineral
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
Pearl
Calcium Carbonate (Aragonite and Calcite), CaCO3
mineral
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with trace Iron (Fe)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Specular Hematite (Specularite)
Hematite (Alpha-Fe2O3)
mineral
Gold Ore in Matrix
Native Gold (Au) in Quartz/Limonite host rock
mineral
Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Pyrite (Iron Pyrite)
Iron Sulfide (FeS2)
mineral
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Sedimentary rock
Citrine Quartz Sphere
Silicon Dioxide (SiO2)
mineral
Anthracite
Anthracite Coal
metamorphic
Basalt
Mafic volcanic rock (consisting mostly of plagioclase, pyroxene, and olivine)
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Sandstone
Arenite or Sandstone
Sedimentary Rock
Labradorite (Feldspar)
Labradorite, (Ca,Na)(Al,Si)4O8
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tree Agate (also known as Dendritic Agate)
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
mineral
Labradorite
Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8
mineral
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Pyrite in Shale
Iron Disulfide (FeS2) in Sedimentary Shale
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Blue Spinel on Marble with Phlogopite
MgAl2O4 (Spinel) in CaCO3 (Calcite/Marble) matrix
metamorphic
Diamond in Kimberlite
Kimberlite Matrix with Carbon (Diamond)
igneous
Pearl
Calcium Carbonate (CaCO3) in the form of Aragonite
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Peridot
Olivine (Mg, Fe)₂SiO₄
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Gold Ore in Quartz/Matrix
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Diamond (or Cubic Zirconia)
Carbon (C) / Cubic Zirconium Dioxide (ZrO2)
mineral
Tiger Iron / Banded Iron Formation
Banded Iron Formation (SiO2 with Fe2O3 and FeOOH)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 + Muscovite/Fuchsite)
metamorphic
Nuummite
Orthoamphibole (mixture of Anthophyllite and Gedrite)
metamorphic
Fossil Coral
Cnidaria fossil (often Calcium Carbonate / CaCO3)
sedimentary
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Specular Hematite
Hematite (Iron Oxide, Fe2O3)
mineral