Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Category
Mineraloid (Man Made Glass)
Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.
Obsidian
Obsidian (Volcanic Glass; SiO2 content > 70%)
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Chemical composition: 70–75% SiO2 + MgO, Fe3O4)
igneous
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite (SiO2 + Fe2O3)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Volcanic glass
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian (Black Obsidian)
Obsidian (Volcanic Glass)
igneous
Amber
Succinite (Organic Mineraloid)
mineral
Rough Sapphire (Corundum)
Corundum (Al2O3)
mineral
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass
Pink Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Mahogany Obsidian
Obsidian (volcanic glass with hematite/magnetite inclusions)
igneous
Native Silver
Silver (elemental Ag)
mineral
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Obsidian
Volcanic Glass (predominantly SiO2, approximately 70% or more)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Chert (specifically Flint)
Chert (SiO2)
sedimentary
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
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Mahogany Obsidian
Volcanic glass (SiO2 + Fe2O3)
igneous
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Chert / Jasper
Silicon Dioxide (SiO₂)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Jasper or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Obsidian
Volcanic Glass (comprised primarily of SiO2)
Igneous
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Diamond (in a jewelry setting)
Diamond (Carbon, C)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chert / Flint Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite (Iron Ore)
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
Mineral