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

Yellow chalcedony (likely tumbled quartz)

Chalcedony, cryptocrystalline SiO₂; possibly iron-stained quartz or yellow jasper

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely iron-stained jasper

Tumbled yellow jasper or chert

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

Tree Agate

Silicon Dioxide (SiO2) with Chlorite inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

Polished orange agate (likely carnelian)

Chalcedony, microcrystalline quartz (SiO₂); orange-red variety commonly called carnelian

Chalcedony (likely common gray chalcedony)

Microcrystalline quartz, SiO₂

Blue Quartz (specifically Dumortierite Quartz)

SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)

Chrysoprase

Silicon dioxide with nickel impurities (SiO2 + Ni)

Polished brown jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich variety

Bloodstone

Heliotrope

Quartz geode

Silica (SiO₂), commonly chalcedony-lined quartz geode

Banded Agate (specifically Lace Agate type)

Silicon Dioxide (SiO2)

Red jasper (likely tumbled jasper/chert)

Microcrystalline quartz, SiO₂, colored red by iron oxides; exact identification from the photo is uncertain.

Polished red jasper beads

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Tumbled orbicular jasper (probable)

Jasper, microcrystalline quartz (SiO₂), with iron- and clay-rich inclusions

Polished orbicular jasper (likely ocean jasper)

Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions

Tumbled yellow quartz (likely citrine or yellow chalcedony)

Quartz, SiO₂; variety uncertain from image

Polished pink-orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony

Jasper

Chalcedony (SiO2)

Tumbled jasper (likely brecciated or red jasper)

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

Polished banded jasper (likely ocean jasper or brecciated jasper)

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

Chalcedony

Chalcedony (SiO2)

Orange-pink chalcedony (likely carnelian/chalcedony rough)

Microcrystalline quartz, SiO₂; iron-oxide-bearing chalcedony

Brecciated jasper/chert

Microcrystalline quartz (SiO₂), with iron-oxide and clay inclusions

Yellow Jasper

Chalcedony (Silicon Dioxide with Iron inclusions), SiO2

Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Polished banded agate (likely carnelian agate)

Microcrystalline quartz, SiO₂ (chalcedony); iron-oxide coloring

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Jasper (Microcrystalline Quartz, SiO2)

Fluorite and Red Jasper

Fluorite (Calcium Fluoride, CaF2) and Red Jasper (Silicon Dioxide, SiO2)

Agate (specifically Oco or Banded Agate)

Agate (a variety of Chalcedony), SiO2 (Silicon Dioxide)

Rose Quartz

Silicon Dioxide (SiO2) with trace elements of Titanium, Iron, or Manganese

Jasper

Chalcedony (SiO2)

Ocean Jasper

Silicon Dioxide (SiO2) microcrystalline quartz aggregate with inclusions

Dyed Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Tumbled yellow jasper or iron-stained chert

Microcrystalline quartz (SiO₂), likely colored by iron oxides

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert

Microcrystalline quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline quartz (SiO2)