Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Chert

Chert (variant of microcrystalline quartz)

Sandstone (Quartzite-rich Pebble)

Arenite (composed primarily of SiO2)

Granite (specifically the Ubatuba variety)

Phaneritic Igneous Rock (Granodiorite/Monzogranite)

Chert / Jasper / Agate (Chalcedony Group)

Microcrystalline Quartz (SiO2)

Banded Chert

Microcrystalline Quartz (SiO2)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline quartz (SiO2)

Jasper Agate (specifically Brecciated Jasper with Agate inclusions)

Silicon Dioxide (SiO2)

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Yellow Chalcedony (Carnelian/Yellow Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Chert Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert / Flint

Chert (Microcrystalline Quartz, SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

River Cobble (Phyllite or Quartzite)

Metasedimentary Rock (often containing SiO2 or KAl2(AlSi3O10)(OH)2)

Chert (Field Stone/Pebble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert / Flint

Cryptocrystalline quartz (SiO2)

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica

Chert (Tan/Yellow variety)

Microcrystalline quartz (SiO2)

Chert (and Flint variant)

Chert (SiO2)

Quartz (Milky/Crystal Variety)

Silicon Dioxide (SiO2)

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Lapis Lazuli

Sodalite-rich metamorphic rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Chert (Jasper/Agate variety)

Cryptocrystalline Quartz (SiO2)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Chert (Flint/Jasper variety)

Microcrystalline Quartz (SiO2)

Chert (Flint Nodular Variety)

Microcrystalline Quartz (SiO2)

Chert (variously identified as Flint)

Microcrystalline Quartz (SiO2)

Dalmatian Jasper

Peralkaline rhyolite with Arfvedsonite inclusions

Milky Quartz

Silicon Dioxide (SiO2)

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Chert (Septarian Nodules / Weathered Silex)

Microcrystalline Quartz (SiO2)

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Chert (specifically Jasper or Brown Chert node)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline quartz (SiO2)

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)