Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)

Chert (with Iron Oxide / Jasperoid Layering)

Microcrystalline Quartz (SiO2)

Banded Agate (Tumbled)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Weathered quartz-rich rock, possibly quartzite or silicified sandstone

Quartz-dominant aggregate; likely microcrystalline quartz (SiO₂), but exact identification requires testing

Chert

Microcrystalline Quartz (SiO2)

Dalmatian Jasper

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Quartz Pebble

Silicon Dioxide (SiO2)

Kambaba Jasper (Crocodile Jasper)

Stromatolite (Fossilized Algae within Microcrystalline Quartz), SiO2

Banded Chert / Jasper

Silicon Dioxide (SiO2)

Quartz Vein in Pelite (Metamorphic Rock)

Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Flint or chert pebble

Microcrystalline quartz (SiO₂), commonly called chert or flint

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Polished brecciated jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Chert with Quartz Veining

Silicon Dioxide (SiO2)

Dragon Blood Jasper

Epidote with Red Jasper (Quartz-rich aggregate)

Tumbled brown jasper

Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides

Conglomerate Pebble (with Chert / Quartz)

Sedimentary Conglomerate / Breccia Pebble

Jasper

Microcrystalline Quartz (SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron inclusions

Flint (chert), possibly worked

Microcrystalline quartz; SiO₂ (chalcedony/quartz aggregate)

Leopard Jasper

Microcrystalline Quartz (SiO2)

Chert Pebble with Quartz Vein

Microcrystalline Quartz (SiO2)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (and Limestone Pebbles)

Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz

Chert

Microcrystalline Quartz (SiO2)

Weathered granite (likely granitic gneiss)

Granite; primarily quartz, feldspar, and biotite/hornblende

Dalmatian jasper (likely orbicular rhyolite)

Silica-rich rhyolite, commonly sold as Dalmatian jasper; typically quartz, feldspar, and dark amphibole/biotite inclusions

Chert (Hagstone/Adder Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Serpentinite

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

Quartz Pebble / Quartzite Pebble

SiO2 (Silicon Dioxide)

Orange chert or jasper fragment

Microcrystalline quartz (SiO₂), likely iron-oxide-bearing jasper

Chert (Polished/Worn)

Microcrystalline quartz (SiO2)

Jasper (Banded Jasper / Chert)

Silicon Dioxide (SiO2 with iron oxide inclusions)

Chert (Flint variety)

Chert (SiO2)

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Conglomerate (with Jasper pebble)

Conglomerate / Microcrystalline Quartz (Jasper)

Tumbled jasper or brecciated jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions

Agate (Polished Slice)

Silicon Dioxide (SiO2)

Zebra Jasper

Silicon Dioxide (SiO2)

Sandstone with Lichen and Iron Oxide Staining

Quartz Arenite / Sandstone

Chert (Flint)

Microcrystalline Quartz (SiO2)