Anthropogenic Material

Dyed blue-purple tumbled stone, likely quartz or calcite

Uncertain; commonly dyed quartzite/chalcedony (SiO₂) or calcite (CaCO₃)

Purple chalcedony or lavender quartz

Cryptocrystalline quartz, SiO₂ (likely chalcedony; identification uncertain from photograph)

Tumbled blue-gray stone, likely basalt or slate

Probable fine-grained basalt; exact identification is uncertain from the photograph

Ring with an Orange Inlay

N/A (Man-made object)

Polished dark greenstone with quartz vein

Likely chlorite-rich metabasalt or greenschist with a quartz–feldspar vein

Tumbled river pebble, likely limestone or weathered chert

Indeterminate carbonate/siliceous pebble; possible micritic limestone or chert

Turquoise bead bracelet

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Iron-rich jasper or hematite-bearing chert

Microcrystalline quartz (SiO₂) with hematite/goethite (Fe₂O₃/FeO(OH))

Fluorescent glassy mineral specimen, possibly hyalite opal

Hyalite (hydrated amorphous silica, SiO₂·nH₂O), tentative

Tumbled amazonite

Amazonite, green microcline feldspar (KAlSi₃O₈)

Quartz-rich iron-stained metamorphic rock (likely quartzite)

Quartzite; predominantly quartz (SiO₂) with iron oxides/hydroxides, possibly feldspar and mica

Likely tumbled iron-stained quartz or chalcedony

Quartz/chalcedony (SiO₂), possibly limonite-coated

Tumbled quartz-rich stone (likely milky quartz/quartzite)

Quartz (SiO₂), possibly quartzite with minor iron-oxide staining

Diorite

Diorite (intermediate intrusive igneous rock)

Sandstone

Arenite (SiO2 based with mineral cement)

Chert (Quartz var.)

Silicon Dioxide (SiO2)

Milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of cellulose)

Petrified Wood

Silicified Wood (SiO2)

Mudstone

Lutylite (group of fine-grained sedimentary rocks)

Cullet Glass / Slag Glass

Amorphous silica glass

Blue sodalite-bearing rock, possibly lapis lazuli

Sodalite (Na₈Al₆Si₆O₂₄Cl₂), commonly in lazurite–calcite–pyrite assemblages

Likely weathered quartz-rich rock fragment

Uncertain; possibly quartz sandstone or a pale feldspathic rock

Banded iron formation fragment (likely hematite–magnetite ironstone)

Banded iron formation; chiefly hematite (Fe₂O₃), magnetite (Fe₃O₄), and microcrystalline quartz (SiO₂)

Chert / Flint

Microcrystalline quartz (SiO2)

Chert (Flint)

Microcrystalline quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Red jasper in a gray host rock (likely jasperized volcanic rock)

Microcrystalline quartz (SiO₂), iron-oxide–colored jasper, in a fine-grained volcanic or sedimentary matrix

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Basalt with pale mineral veins/coating

Likely vesicular or altered basalt, with calcite or zeolite minerals

Likely weathered quartz-rich stone or fossil fragment

Indeterminate; possibly quartz-bearing sandstone, iron-stained quartz, or a fragmentary fossil

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Greenish quartz-bearing rock, possibly serpentine or aventurine

Tentatively quartz (SiO₂) with green inclusions; exact identification requires testing

Likely weathered iron-rich quartz or chert

Microcrystalline quartz (SiO₂), possibly limonite/goethite stained

Polished dragon blood jasper

Jasper, a microcrystalline variety of quartz (SiO₂), colored by iron oxides and other inclusions

Likely calcite-rich limestone

Calcite (CaCO₃), probably micritic or fossiliferous limestone

Petrified Wood / Fossilized Wood

Silicified Wood (Silicon Dioxide - SiO2)

Likely quartz-rich river pebble

Milky quartz or quartz-bearing granitic/gneissic fragment (SiO₂-dominant)

Jasper (likely red/brown jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Likely tumbled jasper or iron-stained quartzite

Microcrystalline quartz (SiO₂), possibly quartzite with iron-oxide inclusions

Small weathered stone, possibly quartz-rich sandstone

Indeterminate siliciclastic rock; likely quartz-bearing sandstone or chert fragment