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

Jasper

Silicon dioxide, SiO2

Chalcedony on Matrix

Silicon Dioxide (SiO2)

Jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂), with possible iron-oxide coloring

Polished yellow-brown agate (likely carnelian or chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Agate

SiO2

Tumbled jasper or chert

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

Red jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides; possibly brecciated jasper

Tumbled red jasper (probable)

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

Chalcedony (Botryoidal/Agate nodule)

Microcrystalline Quartz (SiO2)

Tumbled brown jasper (likely orbicular or brecciated jasper)

Jasper, microcrystalline quartz/chalcedony; SiO₂

Likely rough carnelian (orange-brown chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); variety possibly carnelian

Jasper

Silicon dioxide (SiO2)

Tumbled jasper (likely brecciated or mahogany jasper)

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

Tumbled chalcedony or agate

Microcrystalline quartz (SiO₂), likely pale agate/chalcedony

Red Jasper (with Chert/Quartz)

Silicon Dioxide (SiO2)

Weathered jasper/chert nodule

Microcrystalline quartz (SiO₂), likely iron- and clay-stained jasper or chert

Agate (Polished Sphere)

Silicon Dioxide (SiO2)

Quartz (Chalcedony)

Silicon Dioxide (SiO2)

Tumbled brown agate (probable)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Blue lace agate (likely dyed or color-enhanced)

Microcrystalline quartz (chalcedony), SiO₂

Red Jasper Pebble

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Tumbled jasper or chert

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

Agate

Silicon dioxide (SiO2) - variety Chalcedony

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony Variety

Peach Moonstone

Orthoclase (Potassium Aluminum Silicate, KAlSi3O8)

Red Jasper (in Quartz/Chalcedony)

Silicon Dioxide (SiO2) with iron oxide inclusions

Tumbled brown jasper

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

Polished red jasper (likely brecciated or iron-rich jasper)

Jasper, microcrystalline quartz/chalcedony (SiO₂) with iron-oxide impurities

Jasper (Red/Brown Variety)

Jasper (Microcrystalline Quartz, SiO2)

Jasper (specifically Picture Jasper or Landscape Jasper)

Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz

Chert (often called Flint or Chalcedony Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + impurities)

Polished agate (likely moss or plume agate)

Microcrystalline quartz, SiO₂ (chalcedony)

Likely tumbled jasper or agate

Microcrystalline quartz (SiO₂), possibly iron-rich jasper

Tourmalinated Quartz

Silicon dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Tumbled green agate (likely moss or chalcedony agate)

Cryptocrystalline quartz, SiO₂; likely green chalcedony with possible chlorite or iron inclusions

Tumbled jasper (likely brown/yellow jasper)

Microcrystalline quartz, SiO₂, typically with iron-oxide and clay impurities

Tumbled jasper or weathered chert

Microcrystalline quartz (SiO₂), likely jasper/chert with iron-oxide impurities

Tumbled green jasper (probable)

Jasper, opaque microcrystalline quartz (SiO₂), colored by iron and other impurities

Red jasper fragment

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