Dalmatian jasper
Orbicular microcrystalline quartz rock, commonly rhyolitic or volcanic-feldspar matrix with black arfvedsonite/alkali-amphibole inclusions
igneous
Category
Synthetic Polymer (Synthetic Material)
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Pegmatite with quartz, feldspar, mica, and tourmaline
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, muscovite, and black schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
igneous
Tumbled amethyst
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Chalcedony (gray-white agate)
Microcrystalline quartz, SiO₂
mineral
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Quartz-rich metamorphic rock (likely mica schist or gneiss)
Quartz–feldspar–mica assemblage; probable biotite schist/gneiss
metamorphic
Flint (or Chert)
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Gneiss
Orthogneiss / Paragneiss
metamorphic
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Unknown white fragment
Unknown
unknown
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with artificial dye
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Diamond (or Cubic Zirconia simulant)
C (Carbon) or ZrO2 (Zirconium Dioxide)
gemstone
Chert (specifically Cryptocrystalline Quartz)
Silicon dioxide (SiO2)
sedimentary
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond (faceted)
Carbon (C)
gemstone
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert
Silicon Dioxide (SiO2)
sedimentary
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Chert (or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (varietal Flint)
Silicon Dioxide (SiO2)
sedimentary
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineraloid / impact glass
Diamond
Diamond (C)
mineral
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert / Flint
Chert (SiO2)
sedimentary
Vesicular Basalt (Amygdaloidal)
Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)
igneous