None

Titanium Aura Quartz (Bismuth-coated Druzy)

Silicon Dioxide (SiO2) with Titanium/Metal vapor coating

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Moqui Marble

Iron Oxide Concretion (Limonite/Hematite over Sandstone)

Gold Nugget

Native Gold (Au)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix

Pink Opal

Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions

Obsidian

Volcanic glass (SiO2-rich extrusive igneous rock)

Banded Flint (Polished Stripe Flint)

Silicon Dioxide (SiO2) - variety of Chert

Quartzite

Silicon Dioxide (SiO2)

Citrine (likely Heat-Treated)

Quartz (Silicon Dioxide, SiO2)

Sandstone (Weathered Coastal Boulder)

Arenite (composed primarily of SiO2)

River Siltstone / Mudstone Pebble

Siltstone (composed of mixed silicate and carbonate minerals)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Chert (specifically Gray/Tan Chert Node)

Microcrystalline Quartz (SiO2)

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Quartzite

Quartzite (SiO2)

Synthetic Wolf Plush (Non-mineral)

Canis lupus similis (Prop material: Polyester & Synthetic fibers)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Moqui Marble (Shaman Stone)

Ironstone Concretion (Fe2O3) - primarily Hematite or Goethite shell with Sandstone core

Red Sandstone

Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)

Build-A-Bear Plush (Non-Geological)

Polyester fibers (C10H8O4)n and Synthetic Polymers

Moqui Marble (Moqui Ball)

Ironstone Concretion (Goethite/Hematite cemented Sandstone)

Red Jasper

Silicon Dioxide (SiO2) with impure Iron oxides

Mookaite Jasper

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

Polished Ocean Jasper

Orbicular Jasper (variety of Chalcedony/Quartz, SiO2)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Obsidian

Volcanic Glass (SiO2, usually >70% silica content)

Hematite

Iron(III) oxide (Fe2O3)

Indian Agate

Cryptocrystalline Quartz (SiO2)

Thunderegg (Agate-filled Geode Node)

Silicon dioxide (SiO2) with various inclusions

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Chert (often called Flint or Jasper depending on color)

Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)

Goldstone

Avventurina (Cu + SiO2 glass)

Quartzite

Quartzite (primarily SiO2)

Petrified Wood

Silicified Wood (SiO2)

Black Obsidian

Volcanic Glass (Amorphous Silicon Dioxide, SiO2)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Desert Varnish (on Sandstone)

Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)

Basalt (River or Beach Pebble)

Basalt (Mafic Extrusive Igneous Rock)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Man-made Metal Pin (Non-geological)

Antimony-Lead Alloy or Zinc/Brass Base with Electroplating