Sedimentary (Chemically Precipitated) Or Metamorphic

River Cobble (Gneiss/Migmatite)

Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Yellow Quartzite (River Stone)

Quartzite (primarily SiO2)

Gold-Bearing Quartz

Silicon Dioxide with Native Gold (SiO2 + Au)

Cinnabar

Mercury(II) sulfide (HgS)

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Micaceous Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 - Muscovite component)

Marble

Metamorphosed Limestone (calcite formulation CaCO3)

Gneiss with Quartz Vein

Gneiss containing Quartz (SiO2) filler

White Marble

Recrystallized Calcite (CaCO3)

Gneiss (specifically Banded Gneiss)

Gneiss

Banded Gneiss

Gneiss

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (variant Flint)

Silicon Dioxide (SiO2)

Bauxite / Iron-rich Laterite

Laterite (principally Al(OH)3, Fe2O3, and SiO2)

Banded Chert

Microcrystalline silicon dioxide (SiO2)

Chert / River Pebble

Microcrystalline Silica (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Chert (Jasper or Flint variant)

Chert (composed of microcrystalline quartz, SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Garnet Schist

Garnetiferous Micaceous Schist

Pyrite

Iron Sulfide (FeS2)

Fluorite (Green Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Blue Kyanite

Kyanite (Al2SiO5)

Blue Agate (Dyed Chalcedony)

Silicon Dioxide (SiO2)