Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Category
Sedimentary (Primary) With Artificial Modification
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
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Copper Nugget
Native Copper (Cu)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Porphyry (Flower Stone)
Porphyry (Andesite or Basalt matrix)
igneous
Diamond (in jewelry)
Carbon (C)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Magnetite (Lodestone variety)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Green Fluorite (Beaded)
Fluorite (Calcium Fluoride, CaF2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Leopardskin Jasper
Jasper (a variety of microcrystalline Quartz)
Sedimentary
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Banded Iron Formation (BIF) with Quartz
Banded Iron Formation, often composed of alternating layers of hematite (Fe2O3) or magnetite (Fe3O4) and chert (microcrystalline quartz, SiO2)
Sedimentary
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Agate
Silicon Dioxide (SiO2) - Cryptocrystalline Chalcedony
Mineral
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3, or Pyrite)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Gold Ore (Lode Gold)
Native Gold (Au) in Matrix
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Yellow Jasper
Silicon Dioxide with Iron inclusions (SiO2)
sedimentary
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Banded Iron Formation (BIF)
Banded Iron Formation with Hematite and Jasper
sedimentary
Fossiliferous Limestone (Coquina / Shell Bed)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Mineral
Labradorite (a variety of Feldspar)
Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)
igneous
Quartz
Silicon Dioxide (SiO2)
Mineral
Quartz Grain
Silicon Dioxide (SiO2)
mineral
Quartz (River Cobble)
Silicon Dioxide (SiO2)
mineral
Galena
Lead Sulfide (PbS)
mineral
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Ocean Jasper
Orbicular Quartz (SiO2)
Mineral
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Galena
Lead Sulfide (PbS)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature