Biogenic Material

Diamond (in a gold ring)

Diamond (pure carbon, C)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

Chrysocolla-bearing rock (likely chrysocolla in quartz/limonite matrix)

Chrysocolla, hydrated copper aluminosilicate: (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Green Jasper

Silicon Dioxide (SiO2)

Tumbled tan stone, possibly sandstone or weathered limestone

Indeterminate; likely quartz-rich sandstone or calcitic limestone

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

Cubic Zirconia (or possibly Diamond)

Zirconium dioxide (or Carbon)

Tumbled orange chalcedony or jasper pebble

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony/jasper

Milky Quartz

Silicon Dioxide (SiO2)

Possible iron meteorite

Fe–Ni iron meteorite, possibly an ordinary chondrite or weathered iron-rich specimen

Flint

Microcrystalline Quartz (SiO2)

Tumbled greenstone (likely serpentine or nephrite jade)

Serpentine-group minerals, chiefly antigorite/lizardite; possibly nephrite, a tremolite–actinolite amphibole aggregate

Yellow chalcedony (likely citrine-like quartz)

Cryptocrystalline quartz, SiO₂; possibly iron-stained chalcedony or pale citrine

Tumbled chalcedony (likely pale agate or common opal)

Microcrystalline quartz, SiO₂; possibly hydrated silica, SiO₂·nH₂O, if opal

Polished serpentine-rich stone

Serpentinite, primarily serpentine-group minerals (antigorite, lizardite, or chrysotile)

Tumbled sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Limestone

Calcium Carbonate (CaCO3)

Diorite (Polished Tumble)

Diorite (Intermediate intrusive igneous rock)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Weathered quartz-rich rock fragment

Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing

Brecciated jasper (likely ocean jasper or red jasper)

Microcrystalline quartz, SiO₂, with iron-oxide pigments and breccia cement

Pink quartz-like tumbled stone (possibly dyed quartz or pink chalcedony)

Quartz, SiO₂; appearance may also fit dyed quartzite or pink chalcedony

Beaded blue-and-green gemstone jewelry

Likely dyed or treated chalcedony/agate and green aventurine or glass-like stone; exact identification requires testing

Flint

Microcrystalline quartz (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossil oyster shell

Fossilized bivalve, likely an oyster (family Ostreidae); exact genus and age are indeterminable from the image

Serpentinite with carbonate and iron-oxide alteration

Serpentinite; chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄, with magnetite, calcite, and chromian minerals

Polished leopard skin jasper

Orbicular jasper/chert; chiefly microcrystalline quartz (SiO₂) with iron-oxide and other mineral inclusions

Petrified Wood

Silicified Wood (SiO2)

Faceted Gemstones (Mixed)

Various (e.g., Corundum, Beryl, Quartz, or synthetic equivalents)

Tumbled chert or jasper pebble

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

Polished greenstone (likely serpentine or nephrite jade)

Serpentine-group mineral aggregate, commonly antigorite/lizardite; possible nephrite, a tremolite–actinolite amphibole aggregate

Serpentinite (serpentinized ultramafic rock), possibly with chromite

Serpentine-group minerals, chiefly lizardite and chrysotile; commonly derived from peridotite or pyroxenite, with possible chromite and magnetite

Pink microcline feldspar (likely amazonite-type feldspar)

Microcline, KAlSi₃O₈ (potassium feldspar)

Quartz-veined metamorphic cobble

Likely quartzite or quartz-rich metasedimentary rock; veins predominantly quartz (SiO₂)

Weathered quartz-rich rock, possibly quartzite or chert

Quartz (SiO₂), likely in a quartzite matrix; exact identification is uncertain from the image

Dendritic jasper (brecciated or orbicular jasper)

Microcrystalline quartz (SiO₂) with iron-oxide inclusions

Biotite-rich schist with garnet-like inclusion

Mica schist; predominantly muscovite/biotite mica, quartz, and feldspar, with a possible garnet or weathered mafic fragment

Basalt (Vesicular)

Extrusive mafic igneous rock; primarily (Mg, Fe)2SiO4 (Olivine), CaAl2Si2O8 (Plagioclase Feldspar), and Pyroxene

Sandstone Clast

Arenite (primarily SiO2)

River Siltstone / Mudstone Pebble

Siltstone (composed of mixed silicate and carbonate minerals)