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

Banded Agate

Agate (chalcedony variety of Silicon Dioxide, SiO2)

Tumbled yellow jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions

Banded Agate (likely Carnelian Agate or Sardonyx)

Agate is a common name for a microcrystalline variety of Quartz (SiO₂), specifically a form of Chalcedony.

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper (Brecciated or Mottled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Tumbled blue-gray stone, possibly chalcedony or quartzite

Likely microcrystalline quartz (SiO₂), but the image is insufficient for confident identification

Tumbled chalcedony (likely pale agate or quartz)

Chalcedony, microcrystalline SiO₂

Red Jasper (Chert)

Silicon dioxide (SiO2) with iron oxide inclusions

Chalcedony

Silicon Dioxide (SiO2)

Agate (specifically Botswana or Lake Superior style chalcedony)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Tree Agate (or Moss Agate), faceted into a crystal tower

Dendritic Agate (Silicon Dioxide, SiO2)

Quartz / Chert

Silicon Dioxide (SiO2)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Impurities

Apricot Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Ocean Jasper (Orbicular Jasper)

Silicon Dioxide (SiO2) - Variety of Chalcedony/Quartz

Red Jasper

Silicon Dioxide with iron impurities (Quartz variety, SiO2)

Yellow jasper (likely iron-stained chalcedony)

Microcrystalline quartz, SiO₂, commonly colored by iron oxides/hydroxides

Chert / Flint

Cryptocrystalline Quartz (SiO2)

Jasper (specifically Red or Brecciated Jasper variant)

Jasper (Microcrystalline Quartz - SiO2)

Jasper with Iron Oxides

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Tumbled chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (probable chalcedony)

Red Jasper with Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Blue Lace Agate

Banded Chalcedony (Silica/Quartz), SiO₂

Chrysoprase

Chalcedony (cryptocrystalline SiO2 variety)

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Jasper

Chalcedony (Silicon Dioxide, SiO2)

Banded Calcite

CaCO3

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Yellow Chalcedony

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Brown chalcedony (agate-like flint/chert fragment)

Chalcedony, microcrystalline quartz (SiO₂); identification is tentative from the photo

Polished/tumbled brown jasper (likely weathered chert)

Microcrystalline quartz, SiO₂, with iron-oxide impurities

Tumbled pink chalcedony (likely pink agate)

Chalcedony, microcrystalline SiO₂; variety of quartz

Chalcedony

Chalcedony (SiO₂)

Polished agate geode slice

Microcrystalline quartz (chalcedony), SiO₂

Polished jasper pebble

Jasper (microcrystalline quartz, SiO₂)

Leopard Skin Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Dalmatian Stone

Aplite (often incorrectly called Dalmatian Jasper)