Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Category
Mixed: Igneous And Sedimentary
Browse mixed: igneous and sedimentary specimens identified by the Rock Identifier community.
Learn about Mixed: Igneous And Sedimentary in the encyclopedia
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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pink Calcite (Mangano Calcite)
Calcium Carbonate (CaCO3)
mineral
Gneiss
Gneissic Metamorphic Rock
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Granite Gneiss River Rock
Gneiss
Metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz (Peach/Orange variety)
Silicon Dioxide (SiO2)
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Clear Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Biotite (Black Mica)
Biotite - K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
mineral
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartz
Quartz (Silicon Dioxide) with inclusions, SiO2
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Rough Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Quartz (Amethyst variety)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Peach Moonstone
Potassium Aluminum Silicate, KAlSi3O8
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral