Chert (Yellow/Tan variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Category
Synthetic Polymer (Synthetic Material)
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Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Gastropod Fossil (Snail Steinkern)
Class Gastropoda (internal mold)
sedimentary
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Chert (variations include Flint/Jasper)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (Red/Pink Jasper subtype)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert Nodule (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (with Quartz Druzy)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Tumbled carnelian agate (probable)
Cryptocrystalline quartz, SiO₂; chalcedony variety colored by iron oxides
gemstone
Polished nephrite jade
Nephrite jade; compact amphibole aggregate, chiefly tremolite–actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
metamorphic
Fossilized coral or porous marine limestone
Likely fossil coral (Scleractinia), composed mainly of calcite/aragonite (CaCO₃)
fossil
Tumbled hematite (likely hematite-rich ironstone)
Hematite, Fe₂O₃; possibly mixed with magnetite or goethite
mineral
Polished black-and-white banded stone, likely tourmalinated quartz or zebra jasper
Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄), or quartz-rich zebra jasper
mineral
Rough turquoise-bearing rock (probable turquoise matrix)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host-rock matrix
mineral
Polished tiger iron
Tiger iron; interlayered hematite, jasper, and crocidolite-quartz (often riebeckite)
metamorphic
Dalmatian jasper
Orbicular rhyolite, commonly sold as Dalmatian jasper; mainly quartz, feldspar, and altered mafic minerals
igneous
Polished agate geode slice
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration
mineral
Fossilized bivalve shell
Bivalvia indeterminate; likely a fossil cockle or clam shell, aragonite/calcite replaced or preserved
fossil
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Petrified Wood
Silicified wood (Quartz/Chalcedony replacement of cellulose)
fossil
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Diamond
Diamond (pure Carbon, C)
mineral
Rough Diamond
Diamond (C)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Nuummite
Orthoamphibole (Gedrite-Anthophyllite series)
metamorphic
Pumice (specifically a water-worn, weathered variety)
Vesicular volcanic glass
igneous
Diamond
Native Carbon (C)
mineral
Diamond
Native Carbon (C)
mineral