Organic Material (Likely A Fruit Or Berry)

Agate (specifically Carnelian or Honey Agate)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Granitoid Pebble (Graphic Granite/Pegmatite)

Pegmatitic Granite with Quartz and Orthoclase

Quartzite (Yellow/Iron-stained Quartz)

Quartzite (primarily SiO2 with iron oxide impurities)

Quartzite (River Cobble)

SiO2 (Quartz-rich Metamorphic Rock)

Gold Nugget

Native Gold (Au)

Granite

Granite (Felsic Intrusive Igneous Rock)

Gneiss (with Quartz-Feldspar vein)

Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Red Coral

Corallium rubrum

Nephrite Jade (or Serpentine)

Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals

Quartzite (Beach Pebble)

Quartzite (Composition: SiO2)

Basalt with Quartz Vein and Weathering Crust

Amygdaloidal or Porphyritic Basalt

Yellow Quartz / Quartzite Pebble

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Pyrite (on Shale/Matrix)

Iron Disulfide (FeS2)

Chert (variations include Flint/Chalcedony)

Chert (SiO2 - Silicon Dioxide)

Amethyst Geode

Silicon Dioxide with trace inclusions of Iron (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Chert (Honey Chert or Chalcedony Pebble)

Cryptocrystalline Quartz (SiO2)

Gneiss (Metamorphic Cobble)

Gneiss (High-grade Regional Metamorphic Rock)

Garnet

Garnet Group (Silicate mineral); general formula X3Y2(SiO4)3

Shale

Fissile mudstone (primarily clay minerals and silt-sized quartz)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Quartz Pebble (Iron-stained)

Silicon Dioxide (SiO2)

Greenstone / Diabase Porphyry

Porphyritic Diabase (Micro-gabbro)

Banded Agate (specifically Red Agate or Sardonyx variety)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)

Lavender Agate / Chalcedony Sphere

Agate (Microcrystalline Quartz) - SiO2

Sandstone Concretion with Quartz Center

Sedimentary Clastic Rock (SiO2 matrix with Quartz core)

Chert (containing fossil leaf impression)

Microcrystalline silicon dioxide (SiO2)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz (River Pebble)

Quartz (Silicon Dioxide, SiO2)

Amazonite

Potassium Feldspar (Microcline) - K(AlSi3O8)

Anthracite Coal

Anthracite

Milky Quartz with Epidote or Chlorite inclusions

Silicon Dioxide (SiO2) with inclusions of Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Yellow Quartz Pebble (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Milky Quartz (or Iron-Stained Quartz)

Quartz (Silicon Dioxide, SiO2)

Dragon Vein Agate

Chalcedony (cryptocrystalline silica, SiO2) variety Agate

Agate (specifically Moss or Plume Agate nodding toward Agatized Wood)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz (Chalcedony)