Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Agate Geode with Quartz Druzy

Chalcedony (SiO2) and Quartz (SiO2)

White Jade / White Chalcedony

Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (specifically Pink/Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (River Pebble)

Microcrystalline quartz (SiO2)

Banded Chert (or Flint)

Microcrystalline Quartz (SiO2)

Chert (Tan/Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Chert (Chert Nodule with Chalky Cortex)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Chert (with Quartz veins)

Microcrystalline Quartz (SiO2)

Chert (Smooth River Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (often called Flint in dark varieties)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amethyst or Smoky Quartz Geode Slice

Crystalline Silicon Dioxide (SiO2) with iron impurities

Chert (often called Flint)

Chert (Microcrystalline or cryptocrystalline Silica, SiO2)

Jasper and Chert Conglomerate

Ferruginous Microcrystalline Quartz (SiO2)

Chert Breccia

Brecciated Microcrystalline Quartz (SiO2)

Chert (with Liesegang Banding)

Microcrystalline quartz (SiO2)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Chert (Flint Nodules)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (specifically Flint)

Microcrystalline quartz (SiO2)

Banded Chert

Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)

River Pebble (likely Quartzite or Chert)

Silicon Dioxide (SiO2) crystal conglomerate

Dragon Blood Jasper

Epidote with Red Jasper inclusions (SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))

Chert (Gravel Bit)

Microcrystalline silica (SiO2)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Satin Spar (Selenite)

Gypsum (CaSO4·2H2O)

Chert (River Pebble)

Microcrystalline silicon dioxide (SiO2)

Orange Quartzite (Tumbled)

Quartzite (SiO2)

Kambaba Jasper

Stromatolite (Microbial mat fossil in silicified sediment)

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Kambaba Jasper (Crocodile Jasper)

Stromatolite (Fossilized Algae within Microcrystalline Quartz), SiO2

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Rough Quartz (or Quartzite pebble)

Silicon Dioxide (SiO2)

Chert

Silicon dioxide (SiO2)

Banded Agate

Cryptocrystalline Quartz (SiO2)