Industrial Byproduct (Anthropogenic Rock Like Material)

Drupa Quartz (Sparkly Drusy Quartz on Matrix)

Crystalline Silicon Dioxide (SiO2) on host rock

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Sandstone (with potential iron mineralization)

Arenite

Pumice

Pumicite (Volcanic glass with vesicular texture)

Quartz Geode

Silicon Dioxide (SiO2)

Schist

Lepidoblastic Mica Schist

Sandstone

Arenite

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Petrified Wood

Silicified Wood (primarily SiO₂ / Silicon Dioxide)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 based with various mineral cements)

Red Sandstone

Arenite

Amygdaloidal Basalt with Zeolite/Quartz Infill

Amygdaloidal Basalt (Host: (Mg,Fe)2SiO4 / CaAl2Si2O8; Infill: SiO2 or Na2Al2Si3O10·2H2O)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite Pebble

Quartzite (SiO2)

Coarse Sand Grain / Lithic Fragment

Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)

Iron Ore (Hematite/Goethite)

Ironstone (Fe2O3 / FeO(OH))

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Basalt with Quartz/Feldspar Inclusions

Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining

Obsidian Arrowhead

Volcanic Glass (Primary composition: SiO2)

Quartzite (River Pebble)

Metamorphic Quartz (SiO2)

Mica Schist

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

Sandstone (Quartzose Sandstone)

Arenite (SiO2 principal component)

Sandstone

Arenite (SiO2 based)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Pumice

Pumice (a highly vesicular, silicic volcanic rock)

Jasper (specifically Red Jasper or Iron-stained Chert)

Silicon dioxide (SiO2) with iron oxide inclusions

Sandstone (likely Graywacke or Arkose variant)

Clastic Sedimentary Rock (Lithic Sandstone)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (primarily SiO2)

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Cubic Zirconia

Zirconium Dioxide (ZrO2)

Sandstone (Ferruginous/Banded)

Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)

Massive Quartz

Silicon dioxide (SiO2)

Sandstone

Arenite (variable SiO2 composition)

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Granite Pebble

Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Hornblende)

Pumice

Pumiceous rhyolite