Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Anthropogenic Material)
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Schist
Mica Schist
metamorphic
Blue Sapphire (likely lab-grown or treated)
Corundum (Aluminum Oxide, Al2O3)
gemstone
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Blue Sapphire and Diamond (Set in Metal)
Corundum (Al2O3) and Diamond (C)
mineral
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Mica Schist (Predominantly Muscovite/Biotite)
metamorphic
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Bull Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Water-worn Cobble)
Arenite (SiO2 based)
sedimentary
Quartz-veined Metamorphic Rock
Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz vein in metamorphic rock
Crystalline Silicon Dioxide (SiO2) in Host Rock
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Marble (Carrara Marble style)
Recrystallized Calcite (CaCO3)
metamorphic
Kimberlite with Diamond
Kimberlite (Diamond formula: C)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Gold Nugget
Native Gold (Au)
mineral
Native Copper in Basalt
Amygdaloidal Basalt with Native Copper (Cu)
metamorphic
Limestone
CaCO3 (principally Calcite)
sedimentary
Agate
Cryptocrystalline Quartz (SiO2)
mineral
Auriferous Quartz with Pyrite
Gold-bearing Quartz (SiO2 + FeS2 + Au)
mineral
Garnet (Almandine)
Almandine, Fe3Al2(SiO4)3
metamorphic
Limonite / Ironstone
Hydrated ferric oxide (FeO(OH)·nH2O)
mineral
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3
mineral
Banded River Pebble (Gneiss or Quartz-Veined Basalt)
Polished River Siltstone or Quartzite Gneiss
metamorphic
Cubic Zirconia
Zirconium dioxide (ZrO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limonitic Quartzite
Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining
metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Rough Diamond
Carbon (C)
mineral
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
Chert or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Goldstone
Aventurine Glass (Man-made)
mineral
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Zebra Jasper
Tetragonal Silicon Dioxide (Quartz) with impurities
sedimentary
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Mineral
Rough Diamond
Diamond (Native Carbon, C)
mineral