Mineral, Specifically An Iron Ore

Aragonite (Star Cluster or Twinned variety)

Aragonite (Calcium Carbonate, CaCO3)

Turritella Agate

Silicified Elimia tenera Fossil (SiO2)

Jasper (specifically variegated or swamp jasper beads)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Obsidian (Apache Tear)

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Lapis Lazuli

Lazurite-rich metamorphic rock (complex silicate)

Fluorite

Calcium Fluoride (CaF2)

Schist (specifically Mica Schist)

Mica Schist

Quartz (specifically Milky Quartz Pebble)

Silicon Dioxide (SiO2)

Fluorite Octahedron

Fluorite (Calcium Fluoride, CaF2)

Chert (Chalk-associated Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper Conglomerate (Puddingstone)

Siliceous Conglomerate (Quartz and Jasper clasts in a fine-grained matrix)

Chert

Chert (Microcrystalline Quartz, SiO2)

Chert (Black Chert/Flint)

Cryptocrystalline Quartz (SiO2)

Pink Tourmaline (Rubellite) in Lepidolite

Elbaite (Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)4) in Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Native Silver

Silver (Ag)

Gneiss (specifically a Banded Gneiss pebble)

Gneiss (High-grade Regional Metamorphic Rock)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Banded Agate (specifically Botswana Agate appearance)

Silicon Dioxide (SiO2)

Rhodonite

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

Banded Agate (specifically Botryoidal/Orbicular Agate)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

Zinc Alloy (Silver-plated)

Zinc Alloy Casting (Zn-Al-Mg-Cu)

Chert (often called Flint or Chalcedony Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Epidote (Unakite variety)

Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))

Granodiorite

Granodiorite (Intermediate to Felsic Intrusive Rock)

Chert (often called Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (with Limestone matrix)

Chert (Silica: SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Agate (specifically Botswana or Lake Superior style Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Agate (specifically a small Chalcedony nodule)

Agate (Cryptocrystalline variety of Quartz, SiO2)

Quartz (specifically Citrine or Yellow Quartzite pebble)

Silicon Dioxide (SiO2)

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Crystal (specifically a milky or semi-translucent single crystal point)

Silicon Dioxide (SiO2)

Aragonite (specifically Mexican Marbled Onyx)

Aragonite (Calcium Carbonate, CaCO3)

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Rose Quartz variant)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Agate (specifically Botswana or Lake Superior style chalcedony)

Silicon Dioxide (SiO2)

Agate (specifically, likely a geode slice or nodule)

Agate (a variety of Chalcedony, with chemical formula SiO2)