Organic Material (Likely A Fruit Or Berry)

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Chert (specifically White Chert or Flint)

Microcrystalline or cryptocrystalline quartz (SiO2)

Granite (Pink/Potassium Feldspar Granite)

Felsic Plutonic Rock (Potassium Feldspar, Quartz, Mica, and Amphibole)

Pink feldspar-bearing granite or pegmatite fragment

Mostly potassium feldspar (orthoclase/microcline), quartz, and minor mica; exact identification requires testing

Agatized Dinosaur Bone

Permineralized Dinosaur Bone (Silicified/Agatized Bone)

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Polished green stone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Polished brown stone, likely smoky quartz or jasper

Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing

Tumbled black-and-white stone, likely dendritic agate or jasper

Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites

Raw green aventurine (likely quartzite)

Quartz-rich quartzite, chiefly microcrystalline SiO₂ with green mica/fuchsite or chlorite

Tumbled greenstone, likely nephrite jade

Nephrite jade (interlocking tremolite–actinolite amphibole; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)

River Cobble (Basaltic/Andesitic)

Mafic Igneous Porphyritic Rock

Micro-crystalline Quartz Pebble (Chert)

Silicon dioxide (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Black Jasper (Black Stone / River Pebble)

Silicon Dioxide (SiO₂), Opaque variety of Chalcedony

Iron-rich quartzite or weathered ironstone

Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and goethite

Vesicular volcanic scoria (likely weathered basaltic scoria)

Scoria; chiefly vesicular basalt, composed mainly of plagioclase, pyroxene, and iron-rich glass

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Black Chert/Flint)

Microcrystalline quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Weathered volcanic rock, likely vesicular basalt or scoria

Basaltic volcanic rock; predominantly plagioclase, pyroxene, and possibly olivine with iron-oxide weathering

Yellow Quartzite (River Pebble)

Metamorphic Quartzite (predominantly SiO2 with iron oxide inclusions)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Fossil Coral (Favosites Honeycomb)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline quartz (SiO₂), possibly with mica and feldspar

Quartz geode (likely amethyst-bearing)

Silica geode; quartz, SiO₂, with possible amethyst and minor iron oxides

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Rounded yellow-brown pebble

Likely iron-stained sandstone or quartz-rich river cobble

Tumbled pink feldspar-rich stone, likely granite or microcline

Feldspar-dominant granitoid; probable potassium feldspar (orthoclase/microcline, KAlSi₃O₈) with quartz and minor iron-stained minerals

Chert (Jasper focus)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Seashell Fossil

Invertebrate fossil (phylum Mollusca)

Petrified Wood

Silicified wood / Xylopal

Agate (Geode/Nodule)

Chalcedony (cryptocrystalline silica, SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Petrified Wood (Agatized/Silicified Wood)

Silicified Wood / Chalcedony (SiO2)