Goldstone (aventurine glass)
Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)
Category
Browse man made glass (often grouped with minerals in lapidary) specimens identified by the Rock Identifier community.
Goldstone (aventurine glass)
Man-made copper-bearing glass; not a natural mineral (commonly sold as blue/brown goldstone)
Libyan Desert Glass
Tektite (high-silica impact glass), SiO2
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
Quartz (likely milky quartz or quartz glass-like fragment)
Quartz, silicon dioxide (SiO₂)
Likely clear quartz pebble or glassy quartz fragment
Quartz (silicon dioxide, SiO₂)
Concrete
Anthropogenic Conglomerate
Tumbled gray stone, likely quartz-rich pebble
Probable microcrystalline quartz/chalcedony (SiO₂), possibly gray jasper or quartzite
Jasper Agate
Silicon dioxide (SiO2)
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
Opalite (Synthetic Moonstone/Sea Opal)
Silicon Dioxide (SiO2) glass with metallic inclusions
Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Strawberry Quartz
Silicon Dioxide (SiO2) with Hematite or Goethite inclusions
Ferro-slag (Leland Blue/Slag Glass)
Anthropogenic Vitreous Silica (Industrial Slag)
Tumbled black stone, likely black obsidian
Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Opalite
Synthetic Opalite Glass
Opalite
Synthetic Opalised Glass
Sandstone Concretion
Limonitic Sandstone Concretion
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Slag Glass
SiO2 (Silicon Dioxide) with impurities
Slag
Anthropogenic glassy silicate
Opalite
Synthetic Opalized Glass
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
Goldstone
Aventurine glass (Synthetic glass with copper inclusions)
Mystic Topaz (Treated Quartz or Topaz)
Aluminum silicate fluoride hydroxide [Al2SiO4(F,OH)2] with thin-film metallic coating
Goldstone (Brown/Gold)
Aventurine Glass (Man-made glass with Copper inclusions)
Diamond (or Simulant)
Carbon (C) or relevant simulant formula (e.g., ZrO2 for Cubic Zirconia)
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
Blue glassy gemstone-like specimen
Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Rock crystal quartz fragments
Quartz (silicon dioxide, SiO₂)
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
Not a geological specimen
N/A (man-made object)
Clear quartz fragment (rock crystal)
Quartz, silicon dioxide (SiO₂)
Opalite Egg
Synthetic Glass (Simulated Opal)
Cherry Quartz with Rose Quartz
Crystalline Quartz (SiO2) with glass-based synthetic components
Crescent Pebble
Weathered Quartzite or Sandstone Fragment
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)