Microcrystalline Quartz

Red jasper (likely polished/tumbled)

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Tumbled purple jasper (likely rhyolite-derived jasper)

Microcrystalline quartz (SiO₂) with iron/manganese oxide impurities; possibly purple rhyolitic jasper

Brecciated jasper

Chalcedony–quartz aggregate, predominantly SiO₂, with iron-oxide coloring

Zebra Jasper

Opaque microcrystalline Quartz (SiO2) with impurities

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Smoky quartz (possibly smoky quartz/chalcedony)

Quartz, silicon dioxide (SiO₂), likely natural smoky quartz with conchoidal fracture

Yellow Jasper (Chert/Quartz Pebble)

Silicon Dioxide (SiO2 with iron oxide inclusions)

Red jasper (polished/cut rough)

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

Iron-rich jasper (likely brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) colored by hematite/goethite and iron oxides

Blue Agate

Chalcedony (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Yellow Jasper

SiO2 (Microcrystalline Quartz)

Tumbled carnelian (reddish chalcedony)

Carnelian, a cryptocrystalline variety of quartz (SiO₂)

Orange chalcedony (likely tumbled or naturally water-worn)

Chalcedony, microcrystalline quartz (SiO₂), orange variety possibly carnelian

Tree Agate

Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions

Polished jasper pebble (possibly orbicular jasper)

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

Quartz-rich rock, possibly druzy quartz on altered host rock

Quartz (SiO₂), likely with mica/clay minerals and minor iron-oxide staining

Blue-gray chalcedony (banded agate fragment)

Chalcedony, microcrystalline quartz (SiO₂), likely agate variety

Agate Geode

Cryptocrystalline Quartz (SiO2)

Agate

Silicon Dioxide (SiO2) - Chalcedony variant

Polished agate beads (likely assorted dyed agates)

Agate, a banded variety of microcrystalline quartz (SiO₂)

Tumbled jasper or chert pebble

Microcrystalline quartz (SiO₂), likely jasper/chert

Red Jasper

Microcrystalline Quartz (SiO2) with Hematite inclusions

Red Jasper

Silicon Dioxide (Microcrystalline Quartz), SiO2

Likely waterworn jasper or chert pebble

Microcrystalline quartz (chalcedony), SiO₂

Yellow jasper or polished yellow chalcedony

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

Jasper

Silicon Dioxide (SiO2)

Hag Stone

Perforated Flint / Chert Node

Banded Agate (specifically Sardonyx or Carnelian Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Raw orange chalcedony (carnelian-like)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Black rectangular gemstone pendant, likely obsidian or black glass imitation

Most plausibly black obsidian (volcanic glass; SiO₂-rich), though the image cannot exclude synthetic glass or black onyx

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Dyed Agate

SiO2 (Silicon Dioxide)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Jasper

Silicon dioxide (SiO2)

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite) inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with Iron Hydroxide inclusions

Polished tiger’s-eye jasper (likely brecciated jasper)

Quartz-rich microcrystalline silica; mainly chalcedony/quartz (SiO₂) with iron-oxide pigments

Pink chalcedony or weathered pink quartzite

Microcrystalline quartz (SiO₂), possibly iron-bearing chalcedony

Agate (Plume or Moss Agate variant)

Chalcedony (SiO2) with various inclusions

Zebra Jasper

Tumbled Opaque Chalcedony (SiO2)

Ocean Jasper

Orbicular Jasper / Variolitic Chalcedony (SiO2)