Sandstone
Sedimentary Clastic Rock (Quartzose Sandstone)
sedimentary
Category
Man Made Byproduct (Non Geological)
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Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Breccia
Breccia
sedimentary
Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Polished greenstone pebble
Likely nephrite jade (tremolite–actinolite), though serpentine or greenstone is possible from appearance alone
metamorphic
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Quartz Geode with Calcite
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
Mineral/Geode
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)
igneous
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Carved red jasper bead (likely ceramic imitation)
Jasper, microcrystalline quartz (SiO₂); exact material uncertain from the image
mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Coquina
Bioclastic Limestone
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Tumbled orbicular granite
Granite, predominantly potassium feldspar, plagioclase, quartz, and biotite/hornblende
igneous
N/A (Non-Geological Specimen)
N/A
Faceted purple-blue beads, likely synthetic glass or treated gemstone
Indeterminate; possible synthetic corundum, synthetic spinel, or dyed quartz (SiO₂)
gemstone
Granite
Granite (Felsic Plutonic Rock)
igneous
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Crinoid Columnal Fossil in Chert
Crinoidea stemming section in Microcrystalline Quartz (SiO2)
fossil
Blue slag glass or dyed glass-like industrial material
Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz (Microcrystalline/Chert)
Silicon Dioxide (SiO2)
mineral
Likely slag or metallic industrial byproduct
Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag
mineral
Chalcanthite (Likely Synthetic/Lab-Grown)
Hydrated copper(II) sulfate (CuSO4·5H2O)
mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Zebra Rock (Zebra Stone / Ribbon Stone)
Siltstone with Ferruginous Banding (Primarily Quartz, Kaolinite, and Hematite)
sedimentary
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Weathered limestone with possible fossil or calcite coating
Limestone; primarily calcium carbonate (CaCO₃), chiefly calcite
sedimentary
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Diorite
Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)
igneous
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)