Quartzite with Quartz Veins
Quartzite
Metamorphic
Category
Industrial Byproduct
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Uncertain fine-grained rock or mineral-bearing specimen
Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains
mineral
Fossil brachiopod shell
Likely a spiriferid or orthid brachiopod; shell composed mainly of calcium carbonate (calcite)
fossil
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Smoky Quartz (Rough)
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Siltstone or Mudstone)
Clastic sedimentary rock (primarily SiO2 with various oxides)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Crystalline Silicon Dioxide (SiO2)
mineral
Pink Garnet (likely Almandine or Rhodolite)
Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
River Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Diamond
C (Carbon)
mineral
Likely weathered river pebble
Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert
sedimentary
Pebble
Lithic fragment / Water-worn rock
sedimentary
Sandstone / Quartzite
Sedimentary quartz arenite
sedimentary
Quartz with Feldspar and Mica (Pegmatite Fragment)
Granitic Pegmatite
igneous
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky Quartz / Calcite)
SiO2 (Silicon Dioxide)
mineral
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Pegmatite (Quartz, Feldspar, and Tourmaline/Biotite)
Pegmatitic Igneous Rock
igneous
Pegmatite (Quartz and Feldspar)
Igneous Pegmatite containing SiO2 and KAlSi3O8
igneous
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Coal
Bituminous Coal / Anthracite
sedimentary
Coal
Bituminous Coal / Anthracite
sedimentary
Garnet
Almandine/Pyrope Garnet (Silicate Mineral Group)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Vanadinite on Matrix
Vanadinite (Pb5(VO4)3Cl)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Quartzite (specifically a river-worn pebble)
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Yellow Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Planet Earth
Gaia (Silicate Terrestrial Planet)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Alm: Fe3Al2(SiO4)3
mineral
Quartz Pebble (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Fluorite, Sodalite, and Rose Quartz collection
Calcium Fluoride (CaF2), Sodium Aluminum Silicate with Chlorine (Na8(Al6Si6O24)Cl2), Silicon Dioxide (SiO2)
mineral