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Recent Rock Identifications
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Hematite (Iron Ore)
Hematite (alpha-Fe2O3)
mineral
Limonite-stained Granite
Felsic Plutonic Rock with Hydrated Iron Oxides
igneous
Banded Iron Formation (BIF) / Iron Ore
Banded Iron Formation (composed primarily of Hematite (Fe2O3) and Magnetite (Fe3O4) with Quartz/Chert)
sedimentary
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Carnelian Agate
Silicon dioxide (SiO2) - variety of chalcedony
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Gray Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Common Green Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
mineral
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Quartz (Common or Milky)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite Pebbles
Meta-quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2)
mineral
Citrine
Citrine (Silicon Dioxide - SiO2)
mineral
Agate
Silicon dioxide (SiO2)
mineral
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Chalcedony (Yellow Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Black Marble
Recrystallized Limestone (CaCO3)
metamorphic
Green Aventurine
Quartz (Silicon Dioxide) with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Field Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt
igneous
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
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