Sedimentary (Secondary Classification: Cryptocrystalline Quartz)

Red Jasper with Quartz Vein

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Chert (Limestone-based)

Silicon Dioxide (SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Agate Geode

Silicon Dioxide (SiO2) - variety Chalcedony/Quartz

Chert (Jasper / Flint variant)

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chalcedony (Yellow Agate)

Cryptocrystalline Quartz (SiO2)

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Raw Agate (Chalcedony Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Agate / Chalcedony

Cryptocrystalline Quartz (SiO2)

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Jasper (Green Jasper / Chert)

Silicon Dioxide (SiO2 with inclusions)

Yellow Quartzite (or Yellow Chalcedony Pebble)

Silicon Dioxide (SiO2)

Conglomeratic volcanic breccia

Lithic volcanic breccia, likely andesitic or basaltic

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Red Jasper (with Quartz inclusions)

Silicon Dioxide (SiO2)

Sandstone with Quartz Crystal Infill

Quartz-cemented quartz arenite

Banded Agate (River Stone)

Agate (Silicon Dioxide - SiO2)

Weathered rounded pebble

Likely altered granite or granitic gneiss fragment; exact identification is uncertain from the image

Chert with Quartz/Calcite Vein

Microcrystalline Silica (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Dyed Blue Agate

Cryptocrystalline Quartz (SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz

Chalcedony Geode

Chalcedony (SiO2) within a geode structure

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Tumbled Jasper

Silicon dioxide with impurities (Microcrystalline Quartz, SiO2)

Agate

Silicon Dioxide (SiO2)

Vesicular basalt (scoriaceous volcanic rock)

Basalt, chiefly plagioclase, pyroxene, and commonly olivine; vesicles may be lined with secondary minerals

Yellow Quartz

SiO2 (Silicon Dioxide)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Script Jasper

Silicon Dioxide (SiO2) with impurities

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Quartz-bearing rock, possibly weathered granite or pegmatite

Quartz–feldspar–mica aggregate; exact classification is uncertain from the image

Limonite-stained Chert

Microcrystalline Quartz (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)

Chalcedony (Agate Nodule)

Silicon Dioxide (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

Agate Geode Slice (with Druzy Quartz)

Silicon Dioxide (SiO2)

Dark metamorphic rock, likely hornfels or fine-grained basalt

Probable hornfels; commonly quartz–feldspar–mica with variable amphibole/pyroxene