Mineral, Specifically An Iron Ore

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Pink Granite

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Porphyry

Porphyritic Rhyolite or Andesite

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Stromatolite

Biogenic Sedimentary Rock (composed predominantly of CaCO3)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Crushed Granite Gravel

Granite (Mainly Quartz, Feldspar, and Mica)

Banded Agate (specifically Sardonyx)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Aragonite (Botryoidal/Coralloidal variety)

Aragonite (CaCO3)

Celestite (Celestine)

Strontium sulfate (SrSO4)

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Rose Quartz)

Silicon Dioxide (SiO2)

Fluorite (likely Green Fluorite variant)

Calcium Fluoride (CaF2)

Mica (likely Muscovite)

Muscovite / KAl2(AlSi3O10)(OH)2

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)

Marble

Metamorphosed Limestone/Dolomite

Schist (specifically Mica Schist)

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

Jasper (specifically Owyhee or Picture Jasper variety)

Jasper (Silicon Dioxide, SiO2)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Banded Agate (specifically Sardonyx Agate)

Silicon Dioxide (SiO2) - Chalcedony variety

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).

Quartz Crystal (specifically a small Clear Quartz point)

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)

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

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Quartz (specifically Milky Quartz or Quartzite)

Silicon Dioxide (SiO2)

Chalcedony (specifically Agate or Common Opal variety)

Cryptocrystalline Silica (SiO2)

Moonstone (specifically White Moonstone or Girasol Quartz)

Potassium aluminum silicate (KAlSi3O8)

Banded Agate (specifically Sardonyx or Black Agate variety)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2) - variety of Chalcedony

Agate (specifically Carnelian or Honey Agate)

Silicon Dioxide (SiO2)

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)

Agate (specifically Botswana or Banded Agate variety)

Chalcedony (Silicon Dioxide, SiO2)

Banded Agate (specifically Black Sardonyx/Onyx variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chalcedony (specifically Blue Chalcedony or Common Opal variety)

Silicon Dioxide (SiO₂)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3