Sea Glass
Amorphous silicon dioxide (glass)
mineral
Category
Man Made Silicate (Anthropogenic Glass)
Browse man made silicate (anthropogenic glass) specimens identified by the Rock Identifier community.
Learn about Man Made Silicate (Anthropogenic Glass) in the encyclopedia
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Tektite
Natural impact glass
meteorite
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Green Aura Quartz (Titanium treated Kyanite or Quartz)
Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating
mineral (man-made aura treatment)
Pumice
Pumice (Volcanic silicate glass)
igneous
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Slag (Industrial Glass/Metal Waste)
Artificial silicate/ferro-silicate byproduct
Mineraloid (Industrial byproduct)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sea Glass
Amorphous Silica (Glass) SiO2
Mineraloid (Man-made origin)
Obsidian
Volcanic Glass (70% or more SiO2)
igneous
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Moldavite
Tektite (Natural Silicate Glass)
gemstone
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Goldstone and pink quartz bead strands
Goldstone is aventurescent copper-bearing glass; pink beads are likely rose quartz (SiO₂), though dyed or glass imitations are possible
mineral
Snowflake Obsidian
Spherulitic Obsidian (Amorphous Volcanic Glass with Cristobalite inclusions)
igneous
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Nickel coin (U.S. currency)
Cupronickel (75% Copper, 25% Nickel alloy)
man-made alloy (metallic)
Obsidian Arrowhead
Volcanic Glass (Primary composition: SiO2)
igneous
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
metamorphic
Jasper
Jasper (Silicate - SiO2)
sedimentary
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Chert
Chert (Microcrystalline Quartz)
sedimentary
Mineral and Rock Collection (Assorted)
Mixed collection including Quartz (SiO2), Jasper (SiO2 with impurities), Rose Quartz, and Aventurine
mineral
Weathered chert or chalcedony nodule
Microcrystalline quartz (SiO₂), possibly silicified limestone or agate-like chalcedony
sedimentary
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Chert (Flint)
Silicon dioxide (SiO2)
sedimentary
Unidentified brown mineral/rock fragment
Indeterminate from image; possibly iron-stained quartz, feldspar, or weathered limonite
mineral
Quartz (Small Pebble)
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (SiO2)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2) with hematite/limonite inclusions
mineral
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)