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

Jasper and Chalcedony Composite

Silicon Dioxide (SiO2) microcrystalline quartz

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Blue Chalcedony

Cryptocrystalline Quartz (SiO2)

Chalcedony (likely common gray chalcedony)

Microcrystalline quartz, SiO₂

Tumbled brown jasper (probable)

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

Orange chalcedony or jasper fragment

Microcrystalline quartz (SiO₂), likely chalcedony/jasper

Banded Agate (specifically Lace Agate type)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Iron Oxide inclusions

Chert or chalcedony fragment

Microcrystalline quartz (SiO₂), likely ferruginous chalcedony/jasper

Blue Quartz (specifically Dumortierite Quartz)

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

Brown chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony

Polished banded jasper (likely ocean jasper or brecciated jasper)

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

Polished jasper-like stone

Likely chalcedony (microcrystalline quartz, SiO₂), possibly brecciated jasper

Jasper

SiO2 (Cryptocrystalline quartz)

Polished orange agate (likely carnelian)

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

Dyed Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Fluorite and Red Jasper

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

Bloodstone

Heliotrope

Agate

Silicon Dioxide (SiO2) - Variety of Chalcedony

Polished brown jasper pebble

Microcrystalline quartz (SiO₂), commonly iron-oxide-rich jasper

Tumbled jasper

Microcrystalline quartz (SiO₂), colored by iron oxides and other impurities

Polished orbicular jasper (likely ocean jasper)

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

Rhyolitic jasper / brecciated jasper

Silica-rich volcanic rock, chiefly microcrystalline quartz (SiO₂), with iron-oxide and clay/mineral impurities

Chalcedony (likely agate)

Microcrystalline quartz, SiO₂; agate is banded chalcedony

Carnelian

SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony

Jasper (specifically a banded or dark variety)

Silicon Dioxide (SiO2) with impurities

Green agate (polished bead)

Chalcedony, microcrystalline quartz (SiO₂)

Polished pink-orange chalcedony (likely carnelian)

Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony

Chrysoprase

Silicon dioxide with nickel impurities (SiO2 + Ni)

Jasper

Chalcedony (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz geode

Silica (SiO₂), commonly chalcedony-lined quartz geode

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

Ocean Jasper

Silicon Dioxide (SiO2) microcrystalline quartz aggregate with inclusions

Red Jasper

Jasper (Microcrystalline Quartz, SiO2)

Tumbled carnelian agate

Carnelian, a reddish-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Chalcedony (specifically Agate or Common Opal variety)

Cryptocrystalline Silica (SiO2)

Tumbled yellow quartz (likely citrine or yellow chalcedony)

Quartz, SiO₂; variety uncertain from image

Polished banded agate (likely carnelian agate)

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

Polished brown jasper

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