Chert (Jasper/Flint variety)
Microcrystalline quartz (SiO2)
sedimentary
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Chert (Jasper/Flint variant)
Microcrystalline Quartz (SiO2)
sedimentary
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
sedimentary or igneous
Chert (Flint Nodules)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline quartz (SiO2)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Iron Meteorite
Siderite (Iron-Nickel Meteorite)
mineral
Diamond
Carbon (C)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone with Iron Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Magnetite-rich iron ore (probable magnetite schist)
Magnetite (Fe₃O₄) in a foliated metamorphic matrix, possibly magnetite–biotite schist
metamorphic
Shale
Mudrock / Fissile Shale
sedimentary
Green Sea Glass
Man-made vitreous material (silica glass)
gemstone
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Vesicular volcanic scoria (likely weathered basaltic scoria)
Scoria; chiefly vesicular basalt, composed mainly of plagioclase, pyroxene, and iron-rich glass
igneous
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Mammoth Tooth
Mammuthus tooth fossil
fossil
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Bivalve Fossil (Clam)
Class Bivalvia (Mollusca)
fossil
Diorite with Quartz contact
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Quartz with Pyrite and Lichen
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Sandstone with Fossil Leaf Impression
Sedimentary rock (Sandstone/Siltstone matrix) with Carbonaceous film fossil
fossil
Chondrite Meteorite
Stony Meteorite (Chondrite)
meteorite
Polished Ocean Jasper
Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Limonite (Yellow Ochre)
FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)
Mineral (Iron Ore)
Geode (unopened)
Chert / Chalcedony Geode (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Chert Nodule (Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicon Dioxide (SiO2) - Calcified / Silicified Wood
sedimentary
Chert (and Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
mineral
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula SiO2)
mineral
Chert (often called Flint in this context)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Stone/Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Tumbled jasper (likely brecciated or orbicular jasper)
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral