Man Made Material (Jewelry, Metal Alloy)

Quartzite

Quartzite (primarily SiO2)

Rhodonite Tumbled Chips

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

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (with manganese staining)

Clastic sedimentary rock (primarily SiO2)

Quartzite

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Olivine

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Oolitic Ironstone

Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)

Quartzite

Metamorphic Quartzite (predominantly SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Basalt

Basalt (Mafic volcanic rock)

Schorl (Black Tourmaline) in Quartz and Feldspar

NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Chert (Jasper-like)

SiO2 (Cryptocrystalline Quartz)

Specular Hematite and Magnetite Ore

Iron Oxide (Fe2O3 and Fe3O4)

Chert / Flint

Silicon Dioxide (SiO2)

Chert (variations include Flint or Jasper)

Chert (SiO2)

Coquina / Limonite-stained Limestone

Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Schist

Mica Schist

Ferruginous Slag (Iron Smelting Byproduct)

Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)

Granite

Granite (Phaneritic intrusive igneous rock)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Granite

Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O

Amazonite

Amazonite (KAlSi3O8)

Granite

Granite (Felsic Plutonic Rock)

Chert (Chert Nodule)

Microcrystalline quartz (SiO2)

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Microcrystalline Quartz (SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Gossan (Iron Hat) with Quartz and Chlorite

Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite

Quartz Pebble (with Manganese dendrites/staining)

Silicon Dioxide (SiO2) with Manganese Oxide impurities

Slate

Slate (Regional metamorphic rock composed primarily of quartz, illite, and chlorite)

Quartzite

Metamorphic Quartzite (SiO2)

Sandstone (Yellow/Siltstone variant)

Arenite (SiO2 primarily)

Red Sandstone

Arenite (Fe2O3 rich)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Arkose)

Arenite (Feldspathic Sandstone / Arkose)