Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)
Category
Non Geological
Browse non geological specimens identified by the Rock Identifier community.
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Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Granite
Granite (Felsic Intrusive)
igneous
Granodiorite
Granodiorite (intermediate plutonic rock)
igneous
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
sedimentary
Blue Sea Glass
Amorphous Silica (Anthropogenic glass)
not a rock (man-made origin)
Copper Ore / Altered Granodiorite
Cupriferous rock with silicate gangue
mineral
Siltstone with Fossil Cast
Sedimentary Rock (Siltstone / Fine-grained Sandstone)
sedimentary
Fossilized Brachiopod Shell
Order Spiriferida (likely)
fossil
Moqui Marble (Iron Concretion)
Goethite/Hematite Cement Sandstone Concretion
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Desert Varnish on Sandstone
Quartz Arenite with Iron-Manganese Oxide Coating
sedimentary
Fossilized Gastropod Internal Mold
Gastropoda (Steinkern fossil)
fossil
Limonite Geode / Ironstone Concretion with Quartz
Limonite with Quartz (FeO(OH)·nH2O + SiO2)
sedimentary
Specular Hematite with Quartz and Limonite
Hematite (Fe2O3) with Quartz (SiO2) and Limonite (FeO(OH)·nH2O)
Mineral
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Quartz-filled Basalt Geode
Amygdaloidal Basalt with Quartz (SiO2)
igneous
Smoky Quartz
Smoky Quartz (SiO ₂)
Mineral
Sandstone with Quartz Vein
Quartzose Sandstone with Hydrothermal Quartz
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Banded Chert Pebble
SiO2 (Microcrystalline Quartz)
sedimentary
Lightning Stone / Fulgurite-impregnated or Septarian-like Agate
Silicon dioxide (Quartz/Chalcedony) with host rock matrix
sedimentary
Quartz Vein in Basalt
Silica-infilled basaltic host rock
igneous
Sedimentary Pebble
Sedimentary Rock Fragment
sedimentary
Fossilized Coral (Petoskey Stone precursor)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Calamites (Fossil)
Calamites sp. (Tracheophyta, Equisetopsida)
sedimentary
Crinoid Fossil in Chert
Crinoid (Class Crinoidea) in Microcrystalline Quartz (SiO2)
sedimentary
Quartz crystal
Quartz (Silicon dioxide, SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Gemstone Ring
N/A - Set piece of jewelry, likely Amethyst or Garnet with Diamond or CZ
gemstone
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Mixed rock and mineral collection
Multiple specimens; visible examples may include quartz (SiO₂), amethyst (quartz), calcite (CaCO₃), and dark mafic rocks
mineral
Basalt
Mafic extrusive igneous rock
igneous
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Lava Rock with Fabric Impression
Scoria or Basalt with anthropogenic impressions
igneous
Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Flint
SiO2 (Microcrystalline quartz / Chert)
sedimentary