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

Chert

Microcrystalline quartz (SiO2)

Tumbled chalcedony (likely carnelian or common agate)

Microcrystalline quartz, SiO₂; chalcedony variety

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities

Chert (specifically Pink Chert or Jasperized Chert)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Flint with Chalk Cortex

Chert (Microcrystalline Quartz, SiO2)

Banded Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Tumbled Agate

Silicon Dioxide (SiO2)

Tumbled banded agate

Microcrystalline quartz (chalcedony), SiO₂

Tumbled yellow jasper or iron-stained chert

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Black Onyx

Chalcedony (Silicon Dioxide, SiO2)

Lace Agate (specifically Red Lace Agate)

Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz

Red jasper (tumbled)

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

Tumbled carnelian (red-orange chalcedony)

Carnelian, a microcrystalline variety of quartz; SiO₂

Banded Agate (specifically Botswana or Apricot Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Carnelian Agate

Silicon dioxide (SiO2) - variety of chalcedony

Gray Agate with Druzy Quartz Geode

Cryptocrystalline Quartz (SiO2)

Agate

Silicon dioxide (Chalcedony), SiO2

Picture Jasper

SiO2, Microcrystalline Quartz

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Blue Dyed Agate Geode

Chalcedony (cryptocrystalline Quartz), SiO2

Orange chalcedony or carnelian fragment

Microcrystalline quartz, SiO₂; carnelian is orange cryptocrystalline quartz colored mainly by iron oxides

Flint

Microcrystalline Quartz (SiO2)

Blue Lace Agate

Silicon Dioxide (SiO2)

Jasper (specifically Chert/Ironstone)

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

Polished yellow jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing iron oxides and other silicates

Carnelian

Silicon Dioxide (Chalcedony variety), SiO2

Polished banded jasper pebble

Jasper, a microcrystalline quartz variety (SiO₂), with iron-oxide and clay/mineral impurities

Tumbled yellow-orange chalcedony (likely carnelian or honey agate)

Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides

Tumbled red/orange jasper

Jasper, microcrystalline quartz (chalcedony; SiO₂) with iron-oxide impurities

Tumbled chalcedony (likely yellow agate or citrine-like quartz)

Microcrystalline quartz, SiO₂; yellow coloration may result from iron oxides or inclusions

Rainbow Moonstone

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

Banded Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Polished jasper (likely brecciated or orbicular jasper)

Jasper, microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and other mineral inclusions

Tumbled brown chalcedony/jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony or jasper

Red jasper (likely)

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

Tumbled brown jasper

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

Polished brecciated jasper (likely septarian or iron-rich jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron oxides and possibly calcite or other rock fragments

Blue Agate (Dyed or Treated Chalcedony)

Silicon Dioxide (SiO2), microcrystalline quartz variety

Chalcedony / Agate Pebble

Silicon Dioxide (SiO2)

Jasper pebble (Yellow/Brown Jasper)

Silicon Dioxide (Microcrystalline Quartz, SiO2 with Iron Oxide impurities)

Brown Jasper

Silicon Dioxide (SiO2)

Blue chalcedony crystal pendant

Chalcedony, microcrystalline quartz (SiO₂), likely blue chalcedony or dyed quartz