Sedimentary (Secondary Mineral) Within Igneous

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Turquoise color-bead and Hematite necklace

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Turquoise and Spiny Oyster (Heishi style beads)

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)

Green Quartz (Prasiolite)

Silicon Dioxide (SiO2) with trace impurities

Green Quartz (including Prase or Aventurine variants)

Silicon Dioxide (SiO2) with inclusions (likely Actinolite or Chlorite)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Rhodochrosite in Quartz

Manganese Carbonate (MnCO3)

Granite

Granite (a felsic intrusive igneous rock)

Schist (Micaceous Schist)

Schist (containing mainly Muscovite and Quartz)

Olivine in Basalt (Peridotite Xenolith)

Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Biotite Mica

K(Mg, Fe)3AlSi3O10(F, OH)2

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Magnetite (likely with weathered Limonite/Hematite)

Magnetite (Fe3O4) with iron oxide weathering

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Chert (Jasper variation)

Chert (Silicate mineral, SiO2)

Pegmatitic Granite

Granite (Alkali-feldspar granite) with Quartz and Orthoclase

Granite

Granite (a plutonic rock)

Rutilated Quartz

SiO2 (Quartz) with TiO2 (Rutile inclusions)

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Carnelian

Chalcedony (Silicon Dioxide, SiO2 with Iron Oxide impurities)

Carnelian

Carnelian (variety of Chalcedony, SiO2)

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite and Calcite/Aragonite infusions)

Ferruginous Sandstone

Clastic sedimentary rock (primarily Quartz with Iron Oxide cement)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Orbicular Granite

Orbicular Granitoid

Chert

Chert (Microcrystalline Quartz, SiO2)

Citrine Geode (or Druzy Citrine)

Silicon Dioxide (SiO₂) - a variety of Quartz

Chert (Flint variety)

Silicon Dioxide (SiO2)

Granite (Alkali-feldspar rich)

Phaneritic Felsic Igneous Rock (Major components: KAlSi3O8, SiO2)

Quartz (Raw Chunk)

Silicon Dioxide (SiO2)

Agate Nodule / Weathered Chert

SiO2 (Silicon Dioxide - Microcrystalline Quartz)