Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Category
Organic (Sedimentary Context)
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Pyrite
Iron Disulfide (FeS2)
mineral
Black Marble with Quartz Veining
Metamorphosed Limestone (Recrystallized CaCO3)
metamorphic
Quartzite
Metamorphic Quartz (SiO2)
metamorphic
Red Jasper
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Red Jasper
Jasper (Silicon Dioxide with Hematite inclusions), SiO2
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Magnetite (Octahedral Crystal)
Magnetite (Fe3O4)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Marble
Recrystallized Calcite / Dolomite (CaCO3)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Galena
Lead(II) sulfide (PbS)
mineral
Specular Hematite
Iron Oxide (Fe2O3)
mineral
Marble
Metamorphosed Limestone (CaCO3)
metamorphic
Garnet in Host Rock
Garnet Group (A3B2(SiO4)3)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) with impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Granite
Phaneritic Plutonic Felsic Rock (primarily Quartz (SiO2), Alkali Feldspar, and Plagioclase Feldspar)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Quartzite
Quartzite (chiefly SiO2)
metamorphic
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
White Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Angelite
Anhydrous Calcium Sulfate (CaSO4)
mineral
Marble
Recrystallized Calcite / Dolomite (CaCO3)
metamorphic
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Calcite
Calcite (CaCO3)
Mineral
Yellow Jasper
Cryptocrystalline quartz (SiO2) with iron inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Dark gray metamorphic rock, likely hornfels or fine-grained amphibolite
Hornfels/amphibolite; commonly quartz, feldspar, amphibole, biotite, and minor sulfides
metamorphic
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic