Mineral (Processed Alloy)

Quartz Pebble

Silicon Dioxide (SiO2)

Mica Schist with Quartz

Muscovite/Biotite Schist

Schist

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

Slate with Quartz Vein

Foliated Metamorphic Rock (Mainly Quartz, Muscovite, Chlorite)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz-rich metamorphic rock, likely mica schist

Mica schist; chiefly quartz (SiO₂) with biotite/muscovite mica and possible feldspar

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble with calcite

Silicon dioxide (SiO2) with Calcium carbonate (CaCO3)

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Flint nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon dioxide (SiO2)

Quartz (Orthoquartzite)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic intrusive igneous rock)

Dyed Dalmatian Stone

Aplite (Alkali-feldspar granite) with Arfvedsonite

Granite

Granite (Felsic Plutonic Rock)

Smoky quartz-bearing pegmatitic rock

Quartz, SiO₂, likely with feldspar and mica inclusions

Mica (Biotite and Muscovite) in Matrix

Potassium aluminum silicate with iron/magnesium (KAl2(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(F,OH)2)

Orbicular Rhyolite (Rainforest Jasper)

Rhyolite containing Spherulites (SiO2 with impurities)

Biotite Schist

Biotite-rich Schist

Weathered quartz-rich pebble, possibly milky quartz or chalcedony

Quartz, SiO₂; exact variety uncertain from the image

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Tumbled/Water-worn pebble)

Silicon Dioxide (SiO2)

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Gabbro

Basaltic Plutonic Rock (Gabbro)

Chert (Flint)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Chert / Flint Nodules

Cryptocrystalline Quartz (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Feldspar (Granite Pegmatite matrix)

Potassium Feldspar (KAlSi3O8) / Quartz Mixture

Rounded quartz-rich pebble

Likely milky quartz or quartzite (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Quartz (Silicon dioxide, SiO2)