Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
Green Sea Glass
Amorphous Silica (man-made glass), SiO2 + additive metal oxides
mineraloid / anthropogenic (man-made origin)
Obsidian
Vitreous volcanic silicate (70-75% SiO2)
igneous
Greenstone (Greenschist facies)
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Laterite
Laterite (no specific mineral formula as it's a rock type)
Sedimentary
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Amber
Succinurite (C10H16O)
mineraloid
Quartzite
Quartzite (primarily SiO2)
metamorphic
Note: No specimen visible
N/A
Conglomerate
Conglomerate
Sedimentary Rock
Amber with inclusion
Amber (Fossilized Tree Resin)
mineral
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Amber
Succinite (C10H16O)
mineral
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Ocean Jasper (Orbicular Jasper)
Orbicular Rhyolite (SiO2)
igneous
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Chert (often called Flint or Jasper depending on color)
Chert (SiO2 - Microcrystalline or Cryptocrystalline Quartz)
sedimentary
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
River Cobble (likely Basalt or Metagraywacke)
Non-specific water-worn lithic fragment
igneous or metamorphic
Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Riverstone Quartzite (Iron-stained)
Quartzite (primarily SiO2 with Limonite/Goethite staining)
metamorphic
Obsidian (Black)
Obsidian (High-silica volcanic glass)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Blue Quartzite (River Pebble)
Quartzite (primarily SiO2 with Dumortierite or Crocidolite inclusions)
metamorphic
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Gold Nugget
Native Gold (Au)
mineral
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Banded Gneiss
Gneiss (pronounced "nice")
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with Iron traces)
mineral