Not A Rock (Man Made Industrial Metal)

Basalt

Basalt

Cherry Quartz

SiO2 (Silicon Dioxide with iron-rich inclusions/dye)

Aventurine Quartz

Silicon Dioxide (SiO2) with Fuchsite inclusions

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)

Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

White quartz pebble

Quartz (SiO₂), likely milky quartz

Green Agate

Silicon dioxide (SiO₂)

Opalite

Synthetic opalescent glass

Goldstone

Aventurine glass

Red Sandstone or Brick Fragment

Arenite (if sandstone)

Slag Glass

Silicon dioxide with impurities

Iron-rich meteorite candidate

Unclassified stony-iron or iron meteorite fragment

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Quartzite

Quartzite (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veins in metamorphic/igneous host rock

Quartz Pebble

Silicon Dioxide (SiO2)

Possible weathered metal-rich rock or slag fragment

Uncertain; possibly iron-oxide-rich breccia or industrial slag

Quartzite

Quartzite (SiO2)

Copper Ore (likely Malachite or Chrysocolla staining)

Copper Secondary Mineral (e.g., Cu2CO3(OH)2)

Pumice

Pumicite (Amorphous volcanic glass)

Green Sea Glass

Man-made vitreous material (silica glass)

Quartzite

Quartzite (SiO2)

Dolerite (Diabase)

Dolerite / Diabase

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Quartz vein in Host Rock

Crystalline Silicon Dioxide (SiO2) in Lithic Matrix

US Penny

Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy

Likely small metallic meteorite fragments

Unclassified iron or stony-iron meteorite; mineralogy cannot be confirmed from the image

Bismuth

Bismuth (Bi)

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Obsidian (Blue)

Volcanic Glass (SiO2)

Blue Cracked Quartz (Dyed Fire Crackle Quartz)

Silicon Dioxide (SiO2) with synthetic dye

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Hematite

Iron(III) oxide (Fe2O3)

Quartzite

Quartzite (SiO2)

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

White Marble

Recrystallized Calcite (CaCO3)

Slag Glass (Cullet)

Amorphous Silica / Glass residue

Opalite

Synthetic Opalised Glass