Rock crystal quartz fragments
Quartz (silicon dioxide, SiO₂)
Category
Browse mineral (man made glass) specimens identified by the Rock Identifier community.
Rock crystal quartz fragments
Quartz (silicon dioxide, SiO₂)
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Opalite
Man-made Synthetic Glass (Silicon Dioxide with metal additives)
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
Sea Glass
Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature
Slag
Anthropogenic glassy silicate
Green sea glass (likely)
Man-made glass, likely soda-lime silicate glass; not a natural mineral or rock
Polished labradorite sphere
Labradorite, calcic plagioclase feldspar ((Ca,Na)(Al,Si)₄O₈)
Cherry Quartz with Rose Quartz
Crystalline Quartz (SiO2) with glass-based synthetic components
Goldstone beads (likely brown goldstone)
Man-made copper-bearing glass; not a natural mineral. Often sold as “aventurine glass.”
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky quartz
Blue Sandstone
Man-made glass with cobalt and copper inclusions
Milky quartz (likely quartz crystal fragment)
Quartz, silicon dioxide (SiO₂)
Blue Goldstone
Synthetic glass with cobalt and copper inclusions
Likely iron-rich slag or weathered ironstone fragment
Uncertain; possibly iron oxide–rich material (hematite/goethite) or industrial iron slag
Asphalt Concrete
Bituminous Concrete
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
Red goldstone beads
Goldstone (man-made copper-bearing glass; not a natural mineral)
Diamond
Native Carbon (C)
Goldstone (Brown)
Aventurine Glass (Silicon Dioxide infused with Copper crystals)
Polished labradorite pendant
Labradorite, a calcium-rich plagioclase feldspar (approximately NaAlSi₃O₈–CaAl₂Si₂O₈)
Citrine Quartz
Citrine (Silicon Dioxide, SiO2)
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
Green obsidian (likely molded or heat-treated glass-like specimen)
Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)
Sea Glass
Amorphous silicon dioxide (Man-made glass weathered by nature)
Colorless quartz crystal (likely quartz fragment)
Quartz, silicon dioxide (SiO₂)
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
Ring with an Orange Inlay
N/A (Man-made object)
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
Goldstone
Man-made glass containing cuprous oxide
Polished silver sheen obsidian heart
Obsidian (volcanic glass), primarily rhyolitic silica-rich glass
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)
Green sea glass (likely slag glass or bottle glass)
Man-made soda-lime silicate glass; not a naturally occurring mineral
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
Sandstone Concretion
Limonitic Sandstone Concretion
Stainless Steel (Polished)
Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)
Blue sea glass or blue glassy mineral fragment
Uncertain; likely man-made soda-lime glass, not a natural mineral
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)