Sedimentary (Volcanic)

Bumblebee Jasper (technically Bumblebee Stone)

Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host

Quartz Geode

Silicon Dioxide (SiO2) in a Secondary Sedimentary/Volcanic cavity

Polished river pebble

Indeterminate fine-grained fluvial clast, likely sandstone or chert

Polished red jasper and carnelian-like stones

Jasper: microcrystalline quartz (SiO₂), commonly colored by iron oxides; translucent piece may be carnelian, a chalcedony variety

Metallic sulfide ore fragment, possibly pyrite-bearing rock

Indeterminate; likely pyrite (FeS₂) in a sulfide-rich matrix

Amber (or polished Chalcedony bead)

Fossilized Tree Resin / SiO2 (Silicon Dioxide if Chalcedony)

Tumbled Chalcedony Pebble

Silicon Dioxide (SiO2)

Rounded river pebble

Unidentified fine-grained clastic rock, possibly sandstone or mudstone

Pink tumbled stone, likely rose quartz or pink jasper

Uncertain; quartz (SiO₂) if rose quartz, or microcrystalline quartz/chalcedony if pink jasper

Yellow jasper-like chalcedony

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

Weathered iron-rich rock, possibly hematite-bearing breccia

Hematite (Fe₂O₃)-rich lithic fragment; exact host rock is uncertain from the image

Bumblebee Jasper

Carbonate-rich volcanic rock containing Sulfur and Arsenic (Realgar/Orpiment)

Tumbled brown mineral pebble, possibly jasper or weathered quartzite

Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz

Tumbled brown jasper / chert

Microcrystalline quartz (SiO₂), commonly called jasper or brown chert

Polished jasper pebble (likely brecciated or spiderweb jasper)

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and silica vein networks

Fossilized wood or plant fragment

Petrified wood (silicified fossil wood; commonly Araucarioxylon or related taxa)

Polished/tumbled brown jasper (likely weathered chert)

Microcrystalline quartz, SiO₂, with iron-oxide impurities

Banded jasper (likely mookaite or brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-oxide and clay inclusions

Agate

SiO2

Red Jasper (Quartz)

Silicon Dioxide (SiO2) with Iron impurities

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Chalcedony (Carnelian / Agate pebble)

Microcrystalline Quartz (SiO2)

Jasper

SiO2

Polished red jasper (likely hematite-bearing jasper)

Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite

Carnelian Agate

Chalcedony (SiO2)

Cinnabar on Matrix with Quartz

Mercury(II) sulfide (HgS) on Quartz (SiO2) and Basalt/Siltstone matrix

Chalcedony (Carnelian)

Silicon Dioxide (SiO2)

Blue Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO₂)

Green Chalcedony (Green Agate)

Silicon Dioxide (SiO2)

Polished red jasper

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

Red jasper cabochon pendant

Jasper—opaque microcrystalline quartz/chalcedony, primarily SiO₂, colored red by iron oxides

Tumbled brecciated jasper

Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Polished jasper pebble

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

Red jasper (likely polished/tumbled)

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Polished brecciated jasper (likely ocean jasper or brecciated agate)

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

Carnelian

Carnelian (Silicon Dioxide, SiO2)

Brown Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Leopard Skin Jasper

Silicon Dioxide (SiO2) with impurities

Common Opal

Hydrated Silica (SiO2·nH2O)

Red Jasper (Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions