Antropogenic (Man Made Glass Byproduct)

Quartz Pebble (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Pink Granite (Fragment)

Pink Granite (dominated by Potassium Feldspar: KAlSi3O8)

Granite

Granite (Felsic Plutonic Rock)

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Quartz Pebble (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Rose Quartz

Silicon dioxide (SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Quartzite Pebble

Quartzite (primarily SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Rose Quartz (Silicon Dioxide, SiO2)

Rose Quartz

Silicon dioxide (SiO2)

Rose Quartz

Silicon dioxide (SiO2)

Rose Quartz

SiO2 (Silicon Dioxide)

Pink Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

Pink Quartz (Inclusion-filled)

Silicon Dioxide (SiO2)

Peridot

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

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (70% or more silicon dioxide)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Chert (variations include Flint or Jasper)

Chert (SiO2)

Peridot (Olivine)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Lavender Jade and Snowy Quartz (Druzy)

NaAlSi2O6 (Jadeite) / SiO2 (Quartz)

Pyrite

Iron Sulfide (FeS2)

Chert

Microcrystalline Quartz (SiO2)

Green Banded Agate

Agate (Variety of Chalcedony/Quartz), SiO2

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Wishing Stone (Gneiss or Basalt with Quartz Vein)

Gneiss or Metabasalt (with a Quartz or Calcite intrusion)

Limestone (specifically Dolomitic/Crystalline Limestone)

Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)

Chert with Desert Varnish

Cryptocrystalline Quartz (SiO2) with Manganese/Iron oxide coating

Peridot (Gem-quality Olivine)

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

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Quartzite

Quartzite (mostly SiO2)