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

Tumbled yellow-brown jasper or chalcedony

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

Tumbled chalcedony (likely yellow/brown agate or carnelian)

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

Seam Agate

Agate (Banded variety of Chalcedony, SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Geode

Quartz / Chalcedony nodule

Agate (Geode nodule fragment)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Tumbled agate/chalcedony pebble

Microcrystalline quartz (SiO₂), likely agate or jasper variety

Polished banded agate (likely carnelian and black agate)

Chalcedony, microcrystalline quartz (SiO₂), with iron-oxide coloration

Tumbled jasper, likely red jasper

Microcrystalline quartz (SiO₂), chalcedony variety with iron-oxide impurities

Polished carnelian (red-orange chalcedony)

Carnelian, a microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Red jasper

Microcrystalline quartz (SiO₂), colored mainly by iron oxides

Zebra Jasper

Jasper (variety of Quartz/Chalcedony), SiO2

Red jasper (probable)

Microcrystalline quartz/chalcedony (SiO₂) colored by iron oxides

Quartz (specifically Milky/White Quartz)

Silicon Dioxide (SiO2)

Tumbled jasper (likely picture/brecciated jasper)

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

Chrysoprase

Nickel-bearing Chalcedony (SiO2 with inclusions of Ni-compounds like kerolite or pimelite)

Jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Tumbled agate/chalcedony (likely moss or plume agate)

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

Polished jasper pebble

Microcrystalline quartz (chalcedony), usually with iron-oxide impurities

Tumbled banded agate

Microcrystalline quartz (chalcedony), SiO₂, with layered impurities

Polished agate (likely moss or plume agate)

Microcrystalline quartz, primarily chalcedony (SiO₂), with possible iron-oxide inclusions

Jasper with Quartz Veins

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Orange chalcedony geode

Microcrystalline quartz (SiO₂), commonly called carnelian or orange agate when strongly colored

Polished banded jasper

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

Polished brown agate (likely carnelian/chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Polished brecciated jasper

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

Carnelian (a variety of Chalcedony)

Silicon Dioxide (SiO2) with iron oxide impurities

Tumbled yellow chalcedony (likely yellow jasper)

Microcrystalline quartz, SiO₂; chalcedony/jasper variety

Tumbled blue chalcedony/agate (likely glassy silica material)

Microcrystalline quartz, SiO₂; possibly blue chalcedony or dyed agate

Tumbled yellow chalcedony (likely honey agate or yellow quartz)

Microcrystalline quartz, SiO₂; coloration likely from iron oxides or included minerals

Tumbled orange-and-white chalcedony

Chalcedony, microcrystalline quartz (SiO₂), likely orange carnelian/white agate variety

Tumbled agate or chalcedony

Microcrystalline quartz (SiO₂), likely brown/orange chalcedony or agate

Chalcedony Nodule (Commonly known as Agate or Chert)

Microcrystalline Quartz (SiO2)

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Polished banded agate

Banded chalcedony, microcrystalline quartz (SiO₂)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Tumbled jasper and agate

Microcrystalline quartz (SiO₂), likely jasper/chalcedony; exact varieties cannot be confirmed from the image

Likely tumbled quartz/chalcedony

Quartz (SiO₂), possibly milky quartz or pale chalcedony

Tumbled orange chalcedony or carnelian

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

Chert

Chert (Microcrystalline Quartz, SiO2)

Tumbled brown chalcedony (likely jasper or agate)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining