Mineral, Specifically A Detrital Grain

Petrified Wood

Silicified Wood (SiO2)

Bloodstone

Heliotrope (a variety of Chalcedony, SiO₂ with inclusions)

Banded Agate (specifically Sardonyx)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Quartzite

Quartzite (SiO2)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Gneiss (specifically a Granitic Gneiss specimen)

Gneiss (high-grade metamorphic rock primarily composed of Quartz, Feldspar, and Biotite/Amphibole)

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Basalt with Caliche

Extrusive Mafic Igneous Rock with Secondary Carbonate Crust

Petrified Wood

Silicified Wood (SiO2)

Grey Slate

Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)

Black Jasper (Black Stone / River Pebble)

Silicon Dioxide (SiO₂), Opaque variety of Chalcedony

Petrified Wood

Silicified Wood (primarily Quartz / Chalcedony: SiO2)

Banded Agate (specifically Sardonyx Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

Banded Agate (specifically Chalcedony nodule)

Agate (Silicon Dioxide, SiO2)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Banded Agate (specifically sardonyx or carnelian agate variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Agate (specifically Carnelian Agate or Lake Superior style Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Moonstone (specifically White Moonstone or Girasol Quartz)

Potassium aluminum silicate (KAlSi3O8)

Banded Agate (specifically Botswana Agate or Water-line Agate)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Chalcedony (specifically Agate or Common Opal variety)

Cryptocrystalline Silica (SiO2)

Quartz (specifically Milky Quartz or Quartzite)

Silicon Dioxide (SiO2)

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Blue Quartz (specifically Dumortierite Quartz)

SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)

Quartz Crystal (specifically a small Clear Quartz point)

Silicon Dioxide (SiO2)

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2) - variety of Chalcedony

Banded Agate (specifically Sardonyx or Black Agate variety)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Quartz (specifically Rose or Smoky tinted Quartz)

Silicon Dioxide (SiO2)

Banded Agate (specifically Sardonyx or Red Agate)

Silicon Dioxide (SiO2)

Agate (specifically a Thunderegg/Agate Nodule)

Cryptocrystalline Quartz (SiO2)

Banded Agate (specifically Carnelian Agate)

Cryptocrystalline Quartz (SiO2)

Banded Agate (specifically Black Sardonyx/Onyx variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Agate (specifically Botswana or Banded Agate variety)

Chalcedony (Silicon Dioxide, SiO2)

Chalcedony (specifically Blue Chalcedony or Common Opal variety)

Silicon Dioxide (SiO₂)

Yellow Aventurine

Quartzite with inclusions (SiO2)

Sandstone

Arenite (primarily SiO2)

Garnet (Almandine or Spessartine likely)

Garnet Group Minerals (e.g., Almandine Fe3Al2(SiO4)3, Pyrope Mg3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3)

Diorite

Diorite (intermediate intrusive igneous rock)

Schist (specifically Mica Schist)

Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)