Microcrystalline Quartz

Jasper

Microcrystalline Quartz (SiO2)

Jasper

Microcrystalline Quartz (SiO2)

Green Jasper / Chert Pebbles

Microcrystalline Quartz (SiO2)

Chalcedony (Yellow/Brown Agate Pebble)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Polished red jasper

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

Agate (Chalcedony Pebble)

Silicon Dioxide (SiO2)

Dalmatian jasper (often sold as Dalmatian stone)

Quartz- and feldspar-rich porphyritic volcanic rock; the trade name “Dalmatian jasper” is not a formal mineral species

Red jasper (likely tumbled jasper/chert)

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

Likely chalcedony (gray agate), rough fragment

Microcrystalline quartz, SiO₂; “agate” applies if distinct banding is present

Polished red jasper beads

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

Fossiliferous Chert

Silicon Dioxide (SiO2) with fossil inclusions

Chert (Jasper)

Silicon Dioxide (SiO2)

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony Variety

Tumbled orbicular jasper (probable)

Jasper, microcrystalline quartz (SiO₂), with iron- and clay-rich inclusions

Polished orbicular jasper (likely ocean jasper)

Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions

Fossil Coral

Hexagonaria / Rugosa / Scleractinia

Dalmatian Jasper (Dalmatian Stone)

Peralkaline Rock with Feldspar and Arfvedsonite

Weathered jasper or iron-stained quartzite

Silicified quartz-rich rock, primarily microcrystalline quartz (SiO₂) with iron-oxide/hydroxide staining

Yellow chalcedony (likely heat-treated or resin-coated)

Microcrystalline quartz, SiO₂

Polished brown jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂)

Tumbled jasper or chert

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

Polished brown-green jasper

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

Red jasper pebble

Microcrystalline quartz (SiO₂), colored by iron oxides; possibly brecciated jasper

Tumbled jasper, likely mookaite or brecciated jasper

Microcrystalline quartz (SiO₂), with iron-oxide inclusions

Dalmation Jasper

Perthitic Feldspar with Arfvedsonite inclusions

Polished yellow jasper

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

Yellow chert or jasper pebble

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

Tumbled red jasper (probable)

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

Polished/tumbled iron-rich jasper (likely brecciated jasper)

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

Red jasper (likely polished/chipped fragment)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Bloodstone

Heliotrope (Chalcedony with inclusions of Hematite) - SiO2

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper

Silicon dioxide (SiO2)

Carnelian

Silicon Dioxide (Quartz variety), SiO2

Zebra Jasper

Tectonized Jasper (Silicon Dioxide, SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Yellow-brown jasper (likely iron-stained chert)

Microcrystalline quartz (SiO₂), commonly called jasper when opaque and colored by impurities

Likely rough carnelian (orange-brown chalcedony)

Chalcedony, microcrystalline quartz (SiO₂); variety possibly carnelian

Likely dark green jasper or serpentinite pebble

Undetermined fine-grained rock; possible serpentine-group mineral (approx. Mg₃Si₂O₅(OH)₄) or jasper (microcrystalline SiO₂)