None

Build-A-Bear Plush (Non-Geological)

Polyester fibers (C10H8O4)n and Synthetic Polymers

Petrified Wood

Silicified Wood (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Chert (specifically Jasper or Brown Chert node)

Microcrystalline Quartz (SiO2)

Likely iron-rich volcanic rock (basalt/pyroclastic fragment)

Basaltic rock, potentially weathered andesite; exact identification requires testing

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Citrine

Yellow Quartz (SiO2)

Likely chert or chalcedony

Microcrystalline quartz (SiO₂), possibly waxy chalcedony or chert

Schist (Oxidized)

Mica Schist with Iron Oxide staining

Tektite (Indochinite)

Tektite (Natural silica glass)

Mixed river-worn rock and mineral collection

Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Quartziteite (Pink Quartzite)

Quartzite (composed primarily of Quartz, SiO2)

Obsidian

Amorphous volcanic glass (primarily SiO2)

Siltstone

Siltstone

Mookaite Jasper

Mookaite (variety of Chert/Jasper), Silicon Dioxide - SiO2

Quartzite

Quartzite (SiO2)

Citrine

Silicon dioxide (SiO2) - yellow quartz variety

Sapphire

Corundum (Al2O3)

Quartzite with inclusions

Quartzite

Chrysoprase

SiO2

Milky Quartz

Silicon Dioxide (SiO2)

Gold Sheen Obsidian

Volcanic Glass (SiO2 + impurities)

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Sandstone Pebble

Arenite (SiO2 based)

Ocean Jasper

Orbicular Jasper / SiO2

Tumbled Carnelian

Carnelian (Var. of Chalcedony, SiO2)

Limonite stained Sandstone

Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)

Chert

Microcrystalline Quartz (SiO2)

Gold Nugget

Native Gold (Au)

Red Jasper

Microcrystalline Quartz (SiO2) with Hematite impurities

Quartz (Iron-stained)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Sandstone (Weathered Coastal Boulder)

Arenite (composed primarily of SiO2)

Red Jasper

Chalcedony with Iron Oxide (SiO2)

Bull Quartz

Quartz (Silicon Dioxide - SiO2)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Moqui Marble (Moqui Ball)

Ironstone Concretion (Goethite/Hematite cemented Sandstone)

Sapphire

Corundum (Al2O3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix