Man Made Alloy (Metallic)

Quartz (likely a form of massive or vein quartz)

Quartz (SiO₂)

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Quartz Vein in Sandstone

Sandstone with Hydrothermal Quartz (SiO2)

Petrified Wood

Silicified wood (Quartz variant, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (a variety of Chalcedony, SiO2)

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Citrine

Citrine (Silicon Dioxide, SiO2)

Citrine Quartz Sphere

Silicon Dioxide (SiO2)

Scoria (Red Lava Rock)

Scoria

Yellow Citrine Quartz

Silicon Dioxide (SiO₂)

Brown Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO2)

River Quartz / Quartzite Pebbles

Quartzite (primarily Silicon Dioxide, SiO2)

Agate (Nodule/Chert)

Silicon Dioxide (SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Silica, SiO2)

Amber (Cherry or Red variety)

Succinite (with various trace amounts of organic compounds)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (primarily SiO2)

Quartz

Quartz (SiO2, Silicon Dioxide)

Soapstone

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Imperial Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2), a variety of Actinolite-Tremolite

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Basaltic Scoria

Scoria (Vesicular Basalt/Andesite)

Amber

Succinite (with a generalized formula of C10H16O)

Marble

Metamorphosed Limestone (principally CaCO3)

White Marble

Recrystallized Calcite (CaCO3)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Agate (Dyed High-Grade Polished Slice)

Silicon dioxide (SiO2), Chalcedony crystal variety

Greenstone / Greenstone Pebble

Greenschist (metamorphosed basalt or gabbro)

Jadeite Jade

Jadeite (NaAlSi2O6)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Basalt (River Rock pebble)

Basalt (a mafic extrusive igneous rock)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)