Man Made Glass (Often Grouped With Minerals In Lapidary)

Cullet Glass (Man-made Glass Slag)

Amorphous Silica (SiO2) with chemical additives

Tumbled gray stone, likely quartz-rich pebble

Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite

Concretion with Geode Cavity

Ferruginous Sandstone Concretion with Quartz Center

Opalite (Synthetic Moonstone/Sea Opal)

Silicon Dioxide (SiO2) glass with metallic inclusions

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

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

Quartz, silicon dioxide (SiO₂)

Strawberry Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Opalite

Synthetic Opalised Glass

Opalite

Synthetic Opalite Glass

Opalite

Synthetically produced glass (Silicon Dioxide with metallic inclusions)

Slag Glass

SiO2 (Silicon Dioxide) with impurities

Tumbled black stone, likely black obsidian

Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)

Likely clear quartz pebble or glassy quartz fragment

Quartz (silicon dioxide, SiO₂)

Slag

Anthropogenic glassy silicate

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Concrete

Anthropogenic Conglomerate

Sandstone Concretion

Limonitic Sandstone Concretion

Goldstone

Aventurine glass (Synthetic glass with copper inclusions)

Diamond (or Simulant)

Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)

Opalite

Synthetic Opalized Glass

Red goldstone beads

Goldstone (man-made copper-bearing glass; not a natural mineral)

Bouncy Ball (Synthetic Rubber Polymer)

Polybutadiene / Ethylene Vinyl Acetate (EVA)

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Libyan Desert Glass

Libyan Desert Glass (SiO2 with trace elements)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Goldstone

Man-made glass with copper inclusions

Mystic Topaz (Treated Quartz or Topaz)

Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Carved opalite pendant

Opalite (man-made opalescent glass; not a natural mineral)

Opalite (likely man-made opalescent glass)

Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Opalite Egg

Synthetic Glass (Simulated Opal)

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Blue glassy-looking specimen, possibly dyed or coated mineral

Not identifiable from the photograph; possibilities include dyed quartz or glassy slag, but composition cannot be established visually.

Opalite

Man-made opalescent glass (SiO2 + metal oxides)

Aura Quartz (Pink/Rose Aura Quartz)

Silicon Dioxide (SiO2) bonded with Platinum and/or Silver

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Goldstone beads (likely brown goldstone)

Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”