Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Category
Sedimentary And Metamorphic
Browse sedimentary and metamorphic specimens identified by the Rock Identifier community.
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Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Calcite in Matrix
Calcium Carbonate (CaCO3)
mineral
Quartz (Clear/White)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
Mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Tiger Iron
Tiger Iron (A complex combination of Hematite Fe2O3, Red Jasper SiO2, and Tiger's Eye SiO2/FeOOH)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Clear Quartz (or Rock Crystal)
Quartz (SiO₂)
Mineral
Jasper and Epidote in Quartzite
Metamorphic rock containing microcrystalline quartz, epidote, and jasper
metamorphic
Likely quartz-rich pebble (possibly weathered quartzite)
Quartzite; predominantly SiO₂ (identification tentative from photograph)
metamorphic
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Garnet (Rough Almandine Crystal)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Gneissic boulder
Gneiss, typically quartz–feldspar–mica gneiss
metamorphic
Banded Gneiss River Pebble
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic
Gneiss
Gneiss
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Polished brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Gneiss
Gneiss
metamorphic
Banded Quartzite
Quartzite (principally SiO2)
metamorphic
Green Aventurine
Quartzite (Silicon Dioxide, SiO2 + Fuchsite)
metamorphic