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

Polished brown-green jasper

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

Polished yellow jasper

Jasper, microcrystalline quartz (SiO₂), commonly containing iron oxides and other silicates

Bloodstone

Heliotrope (a variety of Chalcedony, SiO₂ with inclusions)

Tumbled chalcedony (likely milky agate)

Microcrystalline quartz, SiO₂; chalcedony/agate variety

Polished banded agate

Banded chalcedony, microcrystalline quartz (SiO₂)

Blue Quartz

Quartz (Silicon Dioxide) with blue inclusions (SiO2)

Plume Agate

Cryptocrystalline Quartz (SiO2)

Jasper (likely brecciated or chalcedony-rich jasper)

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

Red Jasper

Silicon dioxide with hematite impurities (SiO2 + Fe2O3)

Tumbled red jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Red jasper pebble (likely)

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

Red jasper (likely polished/chipped fragment)

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

Tumbled dendritic agate (likely)

Chalcedony, microcrystalline SiO₂, with dark manganese/iron-oxide inclusions

Black Onyx

Silicon Dioxide (SiO2) with parallel banding

Polished jasper pebble

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

Bumblebee Jasper

Fibrous Calcite with Arsenic and Sulfur Inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Agatized Jasper / Chalcedony

SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Green chalcedony (likely dyed or treated)

Chalcedony, microcrystalline quartz (SiO₂)

Polished carnelian agate cabochon

Microcrystalline quartz (chalcedony), SiO₂, colored mainly by iron oxides

Flint

Microcrystalline Quartz (SiO2)

Tumbled orange-and-white jasper or brecciated chalcedony

Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper; exact variety cannot be confirmed from the image

Tumbled carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Ocean Jasper or Orbicular Jasper

SiO2

Quartz Pebble (Beach Chalcedony)

Silicon Dioxide (SiO2)

Dalmatian jasper (polished stone beads)

Commercial “Dalmatian jasper”; typically a feldspar-rich rock with dark aegirine or arfvedsonite inclusions, not true jasper

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Yellow jasper (likely iron-rich chert)

Microcrystalline quartz, SiO₂, colored by iron oxides/hydroxides

Tumbled brown jasper

Microcrystalline quartz/chalcedony (SiO₂), iron-oxide colored

Red jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, colored mainly by iron oxides

Polished red jasper

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

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chalcedony (Tumbled Agate/Jasper)

Silicon dioxide (SiO2)

Brown chalcedony/agatic jasper nodule

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony with included or weathered host material

Yellow Jasper

Chalcedony (Silicon Dioxide with Iron inclusions), SiO2

Polished brown agate (likely)

Microcrystalline quartz, SiO₂ (chalcedony; agate variety)

Tumbled brown jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly with chalcedony and iron oxides

Red jasper pebble

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