Mineral, Variety Of Chalcedony (Microcrystalline Quartz)

Tumbled brown jasper (likely brecciated jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide and other mineral inclusions

Tumbled brecciated jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide-rich zones

Jasper with Quartz Vein

Silicon Dioxide (SiO2)

Polished blue-gray agate/geode slice (tentative)

Microcrystalline quartz (chalcedony), SiO₂, possibly with druzy quartz

Polished carnelian

Carnelian, a reddish-orange cryptocrystalline chalcedony (SiO₂), colored mainly by iron oxides.

Chalcedony nodule (likely agate)

Microcrystalline quartz, SiO₂; banded varieties are agate

Red jasper (polished/cut rough)

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

Gray chalcedony or quartz fragment

Microcrystalline quartz, SiO₂ (tentative)

Blue Chalcedony

Silicon Dioxide (SiO2)

Tumbled jasper (likely brecciated or red jasper)

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

Tumbled jasper (likely brecciated or ocean jasper)

Microcrystalline quartz (SiO₂), with iron-oxide staining and possible chalcedony

Agate (chalcedony), likely a cut nodule

Agate, a banded variety of microcrystalline quartz (SiO₂); associated iron oxides stain the rough outer matrix.

Banded Agate

Chalcedony (SiO2 with impurities)

Carnelian

Carnelian (SiO2 with Iron Oxide impurities)

Jasper

Silicon dioxide (SiO2) with impurities

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron oxides and pale chalcedony/quartz veins

Polished banded agate

Agate, a banded variety of microcrystalline quartz (SiO₂)

Polished orbicular agate (likely ocean jasper)

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

Blue Lace Agate

Cryptocrystalline Quartz (SiO2) with trace minerals

Chalcedony (Quartz Var.)

Silicon Dioxide (SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Agate Nodule

Silicon dioxide (Chalcedony/Quartz), SiO2

Tumbled jasper or chalcedony

Microcrystalline quartz (SiO₂), likely brown jasper/chalcedony

Tumbled jasper or chalcedony

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

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing hematite, goethite, and clay minerals

Polished multicolored jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), likely iron- and manganese-stained chert

Jasper

Silicon Dioxide (Quartz variety, SiO2)

Tumbled white chalcedony (likely milky quartz)

Chalcedony, cryptocrystalline SiO₂; possibly common quartz or white agate

Chalcedony (Yellow/Honey variety)

Microcrystalline Quartz (SiO2)

Tumbled brown chalcedony (possibly carnelian or agate)

Microcrystalline quartz, SiO₂; exact variety cannot be confirmed from the photo

Polished green agate (likely dyed)

Chalcedony, microcrystalline SiO₂; agate variety

Geode Nodule Fragment

Quartz / Chalcedony Nodule

Jasper

Quartz (SiO2) with impurities

Onyx

Onyx (a variety of Chalcedony, SiO₂)

Chalcedony (Common Opal variant or Quartz)

Silicon Dioxide (SiO2)

Yellow Jasper

Cryptocrystalline Quartz (SiO2 with Iron Hydroxide inclusions)

Red Jasper or Iron-stained Quartz

SiO2 with Fe impurities

Tumbled agate or chalcedony

Microcrystalline quartz (SiO₂), likely agate/chalcedony with green inclusions

Polished agate slice

Agate, a banded variety of chalcedony (microcrystalline SiO₂)

Quartz (Smoky Quartz / Chalcedony)

Silicon Dioxide (SiO2)

Red jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides

Red jasper (likely)

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides