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

Blue Lace Agate

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2)

Polished ocean jasper (orbicular jasper)

Silicified rhyolite, composed mainly of microcrystalline quartz (SiO₂)

Chert (Chert Nodule in Limestone)

Microcrystalline Quartz (SiO2)

Tumbled brown chalcedony (possibly carnelian or agate)

Microcrystalline quartz, SiO₂; exact variety cannot be confirmed from the photo

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Tumbled Black Stone

Unknown, possibly Obsidian, Onyx, or Tourmaline

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Blue Agate (Dyed)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Zebra Jasper

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

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide

Jasper (likely Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with impurities

Banded Agate (specifically Carnelian Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

Flint (or Chert)

Silicon dioxide (Microcrystalline Quartz, $SiO_2$)

Agate (specifically, likely a geode slice or nodule)

Agate (a variety of Chalcedony, with chemical formula SiO2)

Lake Superior Agate

Silicon dioxide (chalcedony variety quartz)

Blue Lace Agate (Polished Point)

Silicon Dioxide (SiO2)

Rose Quartz

Quartz (SiO₂), specifically a variety of Quartz

Green Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Yellow Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Dalmatian jasper (Dalmatian stone)

Feldspar-rich porphyritic igneous rock, commonly sold as Dalmatian jasper; dark spots are mainly amphibole and/or tourmaline minerals

Jasper or Agate

Silicon dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Tumbled chalcedony (likely gray/brown agate)

Microcrystalline quartz, SiO₂ (chalcedony; possible agate variety)

Yellow Jasper / Chert

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Tumbled chalcedony (possibly agate)

Microcrystalline quartz, SiO₂ (chalcedony); banding is not clearly visible to confirm agate

Jasper

Silicon Dioxide (SiO2) - a variety of Chalcedony (Cryptocrystalline Quartz)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled orange chalcedony or quartzite

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony; exact identification requires testing

Jasper (specifically Red Jasper or Iron-stained Chert)

Silicon dioxide (SiO2) with iron oxide inclusions

Red jasper (likely tumbled)

Microcrystalline quartz, chiefly SiO₂, colored red by iron oxides

Chert (Pink/Red variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (Red Jasper)

Jasper (Silicon Dioxide, SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Chert (Agatized/Chalcedony variety)

Microcrystalline Quartz (SiO2)