Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral
Category
Anthropogenic (Man Made Product Subject To Geological Processes)
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Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Quartzite
Quartzite
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Quartz-bearing metamorphic rock, likely garnet-mica schist
Quartz–mica schist with probable garnet and iron-oxide minerals
metamorphic
Granite
Granite (plutonic igneous rock)
igneous
Blue opalite (often sold as synthetic opal)
Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Milky Quartz (with potential inclusion of feldspar)
Silicon Dioxide (SiO2)
Mineral
Aragonite (Flos Ferri)
Calcium Carbonate (CaCO3)
mineral
Red jasper
Jasper (microcrystalline quartz, SiO₂), iron-oxide-rich variety
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Ironstone / Hematite
Iron(III) oxide (Fe2O3)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Slate
Metamorphic Pelitic Rock
metamorphic
Granodiorite
Granodiorite
Igneous
Diabase (Greenstone)
Diabase (Dolerite)
igneous
Diamond in Kimberlite
Diamond (C in Kimberlite Matrix)
igneous
Chert
Silicon dioxide (SiO2)
Sedimentary
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Note: The image provided is a fabric sock, not a geological specimen.
Polyester-Cotton Blend with Elastane
Synthetic/Natural Fiber (Non-Geological)
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite
Quartzite (Metamorphic Quartz Arenite)
metamorphic
Iron Ore / Hematite Rock
Iron oxide (primarily Hematite, Fe2O3)
mineral
Eclogite
Eclogite (composed primarily of Omphacite and Garnet)
metamorphic