Microcrystalline Quartz

Rough Chalcedony / Jasper Agate Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz / Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Tumbled jasper

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

Mookaite Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2)

Banded agate tower (likely onyx/chalcedony)

Microcrystalline quartz, SiO₂; commonly called banded agate or black-and-white onyx

Flint

SiO2 (Microcrystalline Quartz)

Tumbled yellow stone (likely yellow jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂); exact identification is uncertain from the image

Quartzite Pebble (with mineral veining)

Metamorphic Quartzite (SiO2)

Agate (Lace Agate Geode Slice)

Silicon Dioxide (SiO2)

Picture Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartzite Pebble (Microcrystalline Quartz / Chert)

Silicon Dioxide (SiO2)

Polished Ocean Jasper

Silicon Dioxide (Chalcedony/Quartz), SiO2

Yellow jasper (likely)

Microcrystalline quartz, SiO₂, colored by iron oxides; exact identification is uncertain from the photo

Iron-stained chert (possible jasper)

Microcrystalline quartz (SiO₂), likely iron-oxide stained

Red jasper pebble

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

Yellow jasper pebble (possibly iron-stained chert)

Microcrystalline quartz, SiO₂; jasper is an opaque variety of chalcedony

Jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂; iron-oxide-stained chalcedony

Red jasper (likely tumbled)

Microcrystalline quartz, chiefly SiO₂, colored red by iron oxides

Polished brown pebble

Unidentified tumbled stone; possibly brown jasper or agate (microcrystalline quartz, SiO₂)

Tumbled yellow jasper

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

Chert (Grey-Green Var.)

Silicon Dioxide (SiO2)

Chalcedony (Agate / Quartz Pebble)

Silicon Dioxide (SiO2)

Pink Zebra Jasper

Microcrystalline Quartz (SiO2)

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with Iron Oxide / Chlorite inclusions

Yellow Chalcedony (common opal or chert variant)

Silicon Dioxide (SiO2)

Agate (Moss or Banded Agate variety)

Agate (Silicon Dioxide - SiO2)

Jasper

Microcrystalline quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) with impurities

Agate

SiO2 (Silicon dioxide, cryptocrystalline quartz)

Likely iron-rich chert or jasper pebble

Microcrystalline quartz (SiO₂), possibly iron-oxide-stained chert/jasper

Tumbled brown stone, likely jasper

Likely microcrystalline quartz (SiO₂), possibly iron-stained jasper; exact identification is uncertain from the photo

Blue-gray flint (chert) fragment

Microcrystalline quartz (SiO₂), commonly called flint or chert

Chert or chalcedony fragment

Microcrystalline quartz (SiO₂), likely ferruginous chalcedony/jasper

Brecciated jasper/chert

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

Chert / Jasper

Silicon Dioxide (SiO2)

Flint

Silicon dioxide (SiO2)

Polished banded agate (likely petrified wood)

Microcrystalline quartz (SiO₂); possibly silicified wood

Red jasper (likely)

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

Jasper

SiO2 (Silicon Dioxide)

Polished banded stone, likely zebra jasper

Zebra jasper (banded microcrystalline quartz, chiefly SiO₂, with iron-oxide and carbonate impurities)

Flower Agate

Chalcedony (SiO2)