Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Banded Agate (specifically Carnelian Agate)

Cryptocrystalline Quartz (SiO2)

Amygdaloidal Basalt

Vesicular Basalt with secondary mineral infilling (commonly Zeolites, Calcite, or Quartz)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Chalcedony/Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Wonderstone (Liesegang Sandstone)

Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))

Quartzite (River Cobble)

Metamorphic Rock (composed predominantly of SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz-rich Sandstone (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Carnelian

Cryptocrystalline Quartz (SiO2 with iron oxide impurities)

African Turquoise (Jasper)

Silicon Dioxide (SiO2) - Macro-crystalline Quartz with inclusions

River Cobble (Quartzite with Iron Staining)

Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Milky Quartz Vein with Iron Staining

Silicon Dioxide (SiO2)

Slate

Foliated Metamorphic Rock

Chert (Iron-stained)

Chert (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Crinoidal)

Crinoid Limestone (CaCO3 with fossil biological remains)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Red Sandstone

Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)

Que Sera Stone (Llanite)

Rhyolite Porphyry with Blue Quartz and Feldspar

Conglomerate

Conglomerate (clastic sedimentary rock)

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Fossilized Coral

Scleractinian Anthozoa (Fossilized Calcium Carbonate, CaCO3)

Quartzite

Quartzite (SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Limonite-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartzite

Quartzite (mainly SiO2)

Quartzite with Iron Inclusions

Metamorphic Silicon Dioxide (SiO2) with impure Limonite/Hematite

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Orange Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Pink Quartzite

Quartzite (primarily SiO2)