Microcrystalline Quartz

Red Jasper (River-worn)

Silicon Dioxide (SiO2) with Hematite inclusions

Brecciated Jasper (Polished)

Silicon Dioxide (SiO2) with Iron Oxide Impurities

Moss Agate Sphere

Silicon Dioxide (SiO2) with inclusions

Tumbled orange chalcedony or quartzite

Microcrystalline quartz (SiO₂), possibly iron-stained chalcedony; exact identification requires testing

Tumbled red jasper (likely dyed)

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

Polished tumbled jasper (possibly picture jasper)

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Tumbled jasper (likely orbicular or brecciated jasper)

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

Polished carnelian (red-orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), colored by iron oxides

Dalmatian Jasper

Peralkaline Quartz-Feldspar Porphyritic Rock (Dalmatian Stone)

Tumbled brown stone, likely chert or jasper

Microcrystalline quartz (SiO₂), likely ferruginous chert/jasper

Dalmatian Jasper

Feldspar porphyry (Microcline and Quartz with Arfvedsonite spots)

Banded Agate (Carnelian type)

Agate (Cryptocrystalline Quartz, SiO2)

Banded jasper (likely orbicular or brecciated jasper)

Jasper, microcrystalline quartz (SiO₂) with iron-oxide pigments and possible chalcedony

Polished orange-red jasper (probable)

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Polished jasper pebble

Microcrystalline quartz (SiO₂), commonly chalcedony with iron-oxide impurities

Tumbled red jasper

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

Red jasper (likely polished or dyed)

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

Bumblebee Jasper

Carbonate-rich volcanic rock containing Sulfur and Arsenic (Realgar/Orpiment)

River Chalcedony / Agate

Chalcedony (Silicon Dioxide, SiO2)

Yellow Jasper

Cryptocrystalline quartz (SiO2) with iron inclusions

Polished brown jasper or chalcedony

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

Tumbled brown jasper

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

Polished banded chert or jasper pebble

Microcrystalline quartz (SiO₂), likely banded chert; exact variety uncertain from the image

Lake Superior Agate

Silicon Dioxide (Chalcedony/Quartz), formula SiO2

Polished brown jasper (likely ocean jasper or iron-rich jasper)

Microcrystalline quartz, SiO₂, colored by iron oxides and other inclusions

Tumbled red jasper

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

Water-worn brown chert or jasper pebble

Microcrystalline quartz (SiO₂), likely ferruginous chert/jasper

Yellow Agate

Silicon Dioxide (SiO2)

Yellow-brown chert or jasper pebble

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

Tumbled brown chalcedony or jasper

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing chalcedony/jasper

Jasper-Agate (Iron-stained Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper / Chert

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Blue Chalcedony Geode

Silicon Dioxide (SiO2)

Polished dark chert or flint

Microcrystalline quartz (SiO₂), commonly called chert; possibly flint

Jasper (Zebra Jasper)

Silicon Dioxide (SiO2) with impurities

Blue Lace Agate (Polished Point)

Silicon Dioxide (SiO2) - Variety of Chalcedony

Tumbled red jasper

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

Tumbled chalcedony or agate pebble

Microcrystalline quartz (SiO₂), likely chalcedony with possible iron-oxide inclusions

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely jasper/chert; exact identification is uncertain from the photograph

Tumbled jasper/chert, possibly brecciated jasper

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

Red jasper

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