Sedimentary Rock (Technically A Variety Of Chalcedony)

Red Jasper or Iron-stained Quartz

SiO2 with Fe impurities

Satin Spar (Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Agatized Chert / Chalcedony

Silicon Dioxide (SiO2)

Blue Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz - SiO₂)

Geode (Unopened)

Quartz/Chalcedony concretion

Jasper River Stone

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Polished brown-green jasper

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

Red jasper (likely polished/chipped fragment)

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

Dalmation Stone

Peralkaline rhyolite (SiO2 with Arfvedsonite/Riebeckite)

Jasper

Silicon dioxide (SiO2)

Banded Agate

Chalcedony (SiO2) with impurities

Yellow Jasper (within host rock)

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Polished carnelian jasper / brecciated jasper

Microcrystalline quartz (SiO₂), chalcedony with iron-oxide pigments and opaque jasper fragments

Tumbled red jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Dyed pink agate slice

Agate (microcrystalline quartz, SiO₂), commonly chalcedony with artificial dye

Bauxite

Bauxite (Al(OH)3, AlO(OH), AlOOH)

Quartz (Chert / Agate / Chalcedony)

Silicon Dioxide (SiO2)

Tumbled carnelian and related stones

Carnelian: orange-red chalcedony, microcrystalline SiO₂; the dark central piece may be hematite- or jasper-rich material

Tumbled carnelian (likely)

Orange-red chalcedony, microcrystalline quartz (SiO₂)

Agate

SiO2

Carnelian (orange chalcedony)

Chalcedony, microcrystalline quartz (SiO₂), iron-oxide colored

Tumbled jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly containing iron oxides and other silicates

Chalcedony

Silicon Dioxide (SiO2)

Tumbled jasper, likely red/brown jasper

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

Agate Nodule

Silicon dioxide (Chalcedony/Quartz), SiO2

Carnelian

Quartz (chalcedony variety), SiO2

Tumbled jasper pebble

Silica-rich microcrystalline quartz/chalcedony, commonly brecciated or iron-stained jasper (SiO₂)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Chalcedony (Agate)

Cryptocrystalline Quartz (SiO2)

Tumbled carnelian agate

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

Bauxite

Bauxite (Al2O3·nH2O)

Orange chalcedony or carnelian fragment

Microcrystalline quartz, SiO₂; carnelian is orange cryptocrystalline quartz colored mainly by iron oxides

Red Jasper

Silicon Dioxide (SiO2) - variety Jasper

Chert (often called Flint)

Chert (Microcrystalline Quartz, SiO2)

Tumbled green jasper (probable)

Jasper, opaque microcrystalline quartz (SiO₂), colored by iron and other impurities

Likely tumbled carnelian or orange chalcedony

Microcrystalline quartz, SiO₂ (chalcedony variety)

Black obsidian (likely)

Volcanic glass; primarily silica-rich, noncrystalline SiO₂ composition

Red jasper pebble

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

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Tumbled orange chalcedony or carnelian

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

Red jasper (iron-rich chalcedony), possibly brecciated

Jasper: microcrystalline quartz, SiO₂, colored mainly by iron oxides/hydroxides