Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Chalcedony (Common Opal variant or Quartz)

Silicon Dioxide (SiO2)

Green Aventurine

Aventurine (variety of Quartz - SiO2)

Quartz-Veined Mudstone

Argillaceous Mudstone with Quartz Veining

Sandstone with Secondary Mineral Encrustation

Arenite with Silica/Calcite deposits (SiO2 or CaCO3)

Dragon Blood Jasper

Epidote-containing Quartz and Chlorite (SiO2 + (Ca2(Al, Fe)3(SiO4)3(OH)))

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Jasper Geode

Silicon Dioxide (SiO2) with impurities

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Geode (Unopened)

Siliceous Geode (SiO2)

Geode (Unopened)

Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)

Chert (Septarian or Nodular variety)

Microcrystalline Quartz (SiO2)

Druzy Agate (specifically Black Druzy Agate)

Silicon Dioxide (SiO2)

Zebra Jasper

Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz

Dalmatian Stone

Peralkaline Feldsphathic Igneous Rock

Dendritic Agate

Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)

Druzy Quartz on Chert/Siltstone

Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix

Dendritic Agate (River Pebble)

Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions

Chert (varietal: Flint Pitted Pebble)

Cryptocrystalline Quartz (SiO2)

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Milky Quartz in Conglomerate Matrix

Silicon Dioxide (SiO2) within Clastic Sedimentary Rock

Black Obsidian

Volcanic Glass (predominantly SiO2, Silicon Dioxide)

Zebra Jasper

Tetragonal Silicon Dioxide (Quartz) with impurities

Amethyst Sage Agate

Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)

Chert Pebble with Quartz Veining

Microcrystalline Quartz (SiO2)

Yellow Chalcedony (Agate)

Silicon Dioxide (SiO2)

Jasper (Imperial Jasper style)

Silicon Dioxide (SiO2) with impurities

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Chalcedony (Agate/Quartz variety)

Cryptocrystalline Quartz (SiO2)

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)

Travertine

Travertine (CaCO3 - Calcium Carbonate)

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Tree Agate

Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions

Chert (potentially Flint or Mudstone)

Microcrystalline Quartz (SiO2)

Chalcedony (variations like Agate or Jasper)

Chalcedony (SiO₂ - microcrystalline quartz)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Crazy Lace Agate

Silicon Dioxide (SiO2) with iron and aluminum inclusions

Chert with Quartz Veining

Silicon Dioxide (SiO2)

Fossiliferous Chert with Brachiopod Impression

Chert (SiO2) containing Brachiopoda fossil remains