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

Red jasper pebble

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

Tumbled brown jasper

Microcrystalline quartz (SiO₂), commonly with iron-oxide inclusions

Brown chalcedony/agatic jasper nodule

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

Red Jasper

Silicon dioxide with hematite impurities (SiO2 + Fe2O3)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Chalcedony (Tumbled Agate/Jasper)

Silicon dioxide (SiO2)

Quartz (Chalcedony/Agate)

Silicon Dioxide (SiO2)

Tumbled carnelian

Carnelian, orange chalcedony (microcrystalline SiO₂)

Quartz Pebble (Beach Chalcedony)

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

Botryoidal chalcedony (likely quartz with iron staining)

Chalcedony, cryptocrystalline SiO₂; possible quartz druse and limonite/goethite inclusions

Bumblebee Jasper

Fibrous Calcite with Arsenic and Sulfur Inclusions

Tumbled yellow jasper or chert

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

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Tumbled amber-brown chalcedony (probable carnelian/ag ate)

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

Flint

Microcrystalline Quartz (SiO2)

Tumbled chalcedony (likely jasper/chert variety)

Microcrystalline quartz, SiO₂ (chalcedony; opaque varieties commonly called jasper or chert)

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with iron and magnesium inclusions

Jasper

Silicon dioxide (SiO2)

Jasper (Iron-rich)

Silicon Dioxide (SiO2) with Hematite (Fe2O3) impurities

Aventurine (likely Green Aventurine)

Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)

Jasper

Silicon dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Agate (Carnelian Agate with Quartz Matrix)

Silicon Dioxide (SiO2)

Chalcedony with jasper (likely brecciated jasper)

Microcrystalline quartz, SiO₂, with iron-oxide-rich jasper fragments

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2) with iron inclusions

Polished jasper pebble (possibly orbicular jasper)

Microcrystalline quartz (SiO₂), likely jasper; exact variety cannot be confirmed visually

Tumbled chalcedony (likely moss or plume variety)

Microcrystalline quartz, SiO₂

Tumbled brown chalcedony (likely smoky quartz or agate)

Chalcedony, microcrystalline SiO₂; exact variety cannot be confirmed visually

Polished red jasper

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

Chalcedony (Tumbled)

Cryptocrystalline Quartz (SiO2)

Tumbled brown jasper

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

Yellow Jasper

Jasper (Silicon Dioxide, SiO2)

Jasper

Silicon dioxide (SiO2)

Jasper with Epidote Vein

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with iron oxide and other mineral impurities

Tumbled brown agate

Microcrystalline quartz (SiO₂), variety of chalcedony

Polished red jasper and carnelian-like stones

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

Jasper

Silicon dioxide, SiO2

Small rough jasper and agate specimens (identification tentative)

Microcrystalline quartz: chalcedony, SiO₂; opaque varieties are commonly called jasper, while translucent or banded varieties are agate.

Tumbled jasper or chert

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