Antropogenic (Man Made Industrial Byproduct)

Rainbow Hematite (Titanium Coated)

Iron(III) oxide (Fe2O3) with Titanium/Metal Oxide coating

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Asphalt (Bituminous Concrete)

Asphaltum / Bitumen-Aggregate Matrix

Likely tumbled or cut quartz/chalcedony fragment

Silicon dioxide (SiO₂), probably microcrystalline quartz or quartz

Boxwork or Septarian Concretion

Septarian nodule / Boxwork weathering

Iron Slag

Anthropogenic Vitreous Ferrous Silicate

Iron Slag

Anthropogenic Iron oxide/Silicate composite

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Clear quartz sphere

Quartz (silicon dioxide, SiO₂)

Green Agate

Silicon dioxide (SiO₂)

Sandstone (with concrete/human-made layer)

Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)

Mystic Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating

Blue tumbled glass-like specimen; likely blue slag glass

Likely man-made glass (silicate glass), not a natural mineral; exact material cannot be confirmed from the image

Tumbled opalite (likely man-made glass)

Opalite glass; a synthetic opalescent glass, not a natural mineral species

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Obsidian (Blue)

Volcanic Glass (SiO2)

Blue Cracked Quartz (Dyed Fire Crackle Quartz)

Silicon Dioxide (SiO2) with synthetic dye

Pink Quartz / Sea Glass

Silicon Dioxide (SiO2)

Iron Slag

Iron smelting byproduct (Glassy/vesicular silicate)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Slag (Industrial Glass/Byproduct)

Anthropogenic Vitreous Silicate

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

Slag Glass

Amorphous Silica / Glass Slag

Quartz (likely milky quartz or quartz glass-like fragment)

Quartz, silicon dioxide (SiO₂)

Blue opalite glass (likely man-made)

Opalite glass; a silica-based amorphous glass, not natural opal

Rock crystal quartz fragments

Quartz (silicon dioxide, SiO₂)

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Blue Goldstone

Aventurine Glass

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Cobalt Blue Slag Glass

Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives

Faceted clear gemstone, likely quartz or glass imitation

Most likely quartz (SiO₂); exact identification requires refractive-index and hardness tests

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Rounded graywacke or sandstone cobble

Lithified clastic sandstone; likely quartz–feldspar–lithic grain aggregate in a silica or calcite matrix

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Slag (Industrial Glass Slag)

Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)

Goldstone (Red)

Aventurine Glass (Cupriferous glass)