Mineral (Variety Of Chalcedony)

Tumbled agate or chalcedony

Microcrystalline quartz (SiO₂), likely agate/chalcedony with green inclusions

Yellow jasper (likely iron-stained chalcedony)

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

Jasper

Silicon dioxide (SiO2)

Chalcedony

Chalcedony (SiO2)

Yellow Chalcedony

Silicon Dioxide (SiO2)

Yellow Agate

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

White Agate (Chalcedony)

Chalcedony (SiO2)

Agate

Chalcedony (SiO2)

Polished jasper pebble (possibly orbicular jasper)

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

Tumbled brown agate (possible carnelian or chalcedony)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Chalcedony (Agate)

Silicon Dioxide (SiO2)

Tumbled red-and-cream jasper

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

Orange chalcedony or tumbled carnelian fragment

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

Lake Superior Agate

SiO2 (Quartz variety chalcedony)

Polished carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled jasper

Microcrystalline quartz (SiO₂), commonly iron-stained chalcedony/jasper

Tumbled yellow jasper

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

Agate

Cryptocrystalline quartz, SiO2

Tumbled yellow chalcedony (probable)

Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper

Sardonyx or Carnelian Agate

Silicon Dioxide (SiO2) with iron impurities

Light-colored agate (likely chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); exact variety is uncertain from the image

Yellow Jasper

SiO2

Carnelian

Silicon dioxide (SiO2) with Iron Oxide impurities

Honey-colored chalcedony (rough agate/chert)

Microcrystalline quartz, SiO₂; likely chalcedony with iron-oxide staining

Tumbled orange chalcedony or carnelian

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

Tumbled orange chalcedony or carnelian

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled translucent quartz or chalcedony fragment

Silicon dioxide, SiO₂; likely quartz/chalcedony

Tumbled carnelian/chalcedony

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony

Tumbled agate/chalcedony (likely moss or plume agate)

Microcrystalline quartz, SiO₂, chiefly chalcedony with possible iron-oxide inclusions

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

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

Red jasper-like chalcedony pebble

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

Agate

SiO2 (Silicon dioxide, chalcedony variety)

Polished brecciated jasper (likely picture jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and clay inclusions

Polished orbicular jasper

Microcrystalline quartz (SiO₂) with iron-rich and altered volcanic inclusions

Tumbled carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Bloodstone

Chalcedony (Variety Heliotrope), SiO2

Lake Superior Agate

Silicon Dioxide (Chalcedony variety)

Red Chalcedony (likely dyed)

Chalcedony (a variety of Quartz), SiO2

Polished banded agate

Banded chalcedony, microcrystalline quartz (SiO₂)

Tumbled carnelian and related stones

Carnelian: orange-red chalcedony, microcrystalline SiO₂; the dark central piece may be hematite- or jasper-rich material