Mineral_variety_of_chalcedony

Polished orbicular agate (likely ocean jasper)

Microcrystalline quartz, SiO₂; chalcedony with orbicular patterns and possible mineral inclusions

Yellow jasper (likely iron-stained chalcedony)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); likely iron-oxide colored

Jasper

Silicon dioxide (SiO2)

Tumbled chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (probable chalcedony)

Agate (or Quartz with Agate banding)

Silicon dioxide (SiO2)

Agate

SiO2

Yellow Jasper

Silicon dioxide, SiO2

Plume Agate or Moss Agate

Agate (SiO2)

Agate Geode Nodule

Chalcedony / Quartz (SiO2)

Tumbled brown jasper or chalcedony

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

Chalcedony Nodule in Matrix

Silicon Dioxide (SiO2)

Chalcedony

Silicon dioxide (SiO2) - Microcrystalline quartz

Red Jasper

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Chrysoprase

Chalcedony with nickel impurities (SiO2)

Chalcedony (rough)

Microcrystalline quartz, SiO₂; likely gray chalcedony with iron-oxide staining

Likely banded agate pebble

Microcrystalline quartz (chalcedony), SiO₂

Polished yellow-brown agate (likely carnelian or chalcedony)

Microcrystalline quartz, SiO₂; chalcedony with iron-oxide coloration

Agate

SiO2

Jasper

SiO2

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Tumbled orange-and-white chalcedony

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

Polished orbicular jasper (likely ocean jasper)

Silica-rich microcrystalline quartz/chalcedony, SiO₂; precise variety uncertain from the photo

Tumbled jasper (likely mookaite or brown/orange jasper)

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

Weathered agate or chalcedony nodule

Microcrystalline quartz (SiO₂), likely chalcedony/agate

Tumbled amber-colored chalcedony and quartz

Chalcedony (microcrystalline SiO₂), quartz (SiO₂), possibly carnelian or citrine; one piece may be druzy chalcedony

Yellow-orange chalcedony (possibly carnelian)

Microcrystalline quartz, SiO₂; orange coloration commonly from iron oxides

Tumbled amber-colored agate or chalcedony

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

Tumbled gray-blue agate/chalcedony

Microcrystalline quartz (SiO₂), likely banded chalcedony or agate

Tumbled pink chalcedony (likely pink agate/jasper)

Microcrystalline quartz, SiO₂, with iron-oxide coloring

Tumbled carnelian/chalcedony

Chalcedony (microcrystalline quartz), SiO₂; reddish color from iron oxides

Tumbled agate/chalcedony pebble

Microcrystalline quartz (SiO₂), likely brown/banded agate or jasper

Polished brecciated jasper

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

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Red jasper (likely tumbled)

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

Yellow Jasper

Silicon dioxide (SiO2)

Agate

SiO2

Polished jasper pebble

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

Polished yellow chalcedony (likely lemon agate or yellow jasper)

Microcrystalline quartz, SiO₂

Lake Superior Agate

Silicon dioxide (chalcedony variety quartz)

Red Jasper

Silicon Dioxide (SiO2) with hematite inclusions

Orange chalcedony or tumbled carnelian fragment

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

Banded Agate

Chalcedony (SiO2) with impurities