Mineral (Specifically A Variety Of Chalcedony, Which Is Microcrystalline Quartz)

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide inclusions

Aventurine (likely Green Aventurine)

Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)

Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Botryoidal chalcedony (likely quartz with iron staining)

Chalcedony, cryptocrystalline SiO₂; possible quartz druse and limonite/goethite inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2) with iron inclusions

Tumbled chalcedony (likely jasper/chert variety)

Microcrystalline quartz, SiO₂ (chalcedony; opaque varieties commonly called jasper or chert)

Tumbled chalcedony (likely moss or plume variety)

Microcrystalline quartz, SiO₂

Banded agate (chalcedony)

Microcrystalline quartz (SiO₂), variety chalcedony

Jasper (specifically Chert or Orbicular Jasper)

Silicon Dioxide (SiO2)

Tumbled amber-brown chalcedony (probable carnelian/ag ate)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony (carnelian)

Tumbled yellow jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper/chert

Brown agate (chalcedony)

Microcrystalline quartz, SiO₂; likely iron-stained chalcedony

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Oceanside Agate (Orbicular Agate)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Jasper with Epidote Vein

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Jasper

Silicon dioxide (SiO2)

Chalcedony (Tumbled)

Cryptocrystalline Quartz (SiO2)

Polished brown agate beads

Microcrystalline quartz (SiO₂), commonly classified as chalcedony; the exact variety cannot be determined from the image

Weathered jasper (iron-stained chert)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide impurities

Tumbled brown agate

Microcrystalline quartz (SiO₂), variety of chalcedony

Chert (specifically Yellow Jasper variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral impurities

Chalcedony with jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, with iron-oxide-rich jasper fragments

Polished jasper pebble (possibly orbicular jasper)

Microcrystalline quartz (SiO₂), likely jasper; exact variety cannot be confirmed visually

Tumbled brown chalcedony (likely smoky quartz or agate)

Chalcedony, microcrystalline SiO₂; exact variety cannot be confirmed visually

Jasper

Silicon dioxide (SiO2)

Agate (Carnelian Agate with Quartz Matrix)

Silicon Dioxide (SiO2)

Dragon Blood Jasper

Epidote-rich Quartzite (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)

Chalcedony (SiO₂)

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides.

Polished banded jasper (likely red jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides; exact variety uncertain

Jasper with Quartz

Silicon dioxide (SiO2)

Quartz (specifically a water-worn Quartzite or Chalcedony pebble)

Silicon Dioxide (SiO2)

Brecciated Red Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Polished red jasper and carnelian-like stones

Jasper: microcrystalline quartz (SiO₂), commonly colored by iron oxides; translucent piece may be carnelian, a chalcedony variety

Rainbow Moonstone

White Labradorite (formula: (Na,Ca)(Al,Si)4O8)

Dyed agate slice

Microcrystalline quartz (SiO₂), typically banded chalcedony

Red Jasper

Argillaceous microcrystalline quartz (SiO2 with Fe2O3 inclusions)

Banded Calcite (often commercially sold as Mexican Onyx or Green Onyx)

Calcium Carbonate (CaCO3)

Small rough jasper and agate specimens (identification tentative)

Microcrystalline quartz: chalcedony, SiO₂; opaque varieties are commonly called jasper, while translucent or banded varieties are agate.