Geode (Unopened)
Quartz Geode (SiO2) / Chalcedony Concretion
mineral
Category
Antropogenic Rock (Man Made)
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Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert
Microcrystalline quartz (SiO2)
sedimentary
Crinoid Fossil in Limestone
Crinoid columnal (Class Crinoidea) in biomicrite
fossil
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Tumbled orbicular granite
Granite, predominantly potassium feldspar, plagioclase, quartz, and biotite/hornblende
igneous
Granodiorite
Granodiorite (Quartz + Plagioclase + Alkali Feldspar + Biotite/Hornblende)
igneous
Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Anthropogenic (Man-made)
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Yooperlite (Syenite clast containing fluorescent Sodalite)
Sodalite-bearing Syenite
igneous
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Chert (Jasper/Flint variety)
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
Chert
Microcrystalline quartz (SiO2)
sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Greenstone / serpentinite carving
Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile); exact identification requires testing
metamorphic
Flint
Silicon dioxide (SiO2)
sedimentary
Chert (Chalcedony/Agate)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Industrial Slag
Anthropogenic Vitreous Slag
igneous
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Blue glass-like tumbled specimen
Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image
mineral
Chert (or Flint)
Chert (cryptocrystalline quartz), SiO2
Sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Sandstone
Arenite
sedimentary
Basalt
Basalt (comprising Plagioclase feldspar, Pyroxene, and Olivine)
igneous
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Tektite
Impactite (Natural Silicate Glass)
meteorite
Slate
Metamorphic pelitic rock
metamorphic
Granite
Intrusive Felsic Igneous Rock (primarily Quartz and Feldspar)
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Chert (Flint)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Coquina and Oyster Fossil Rock
Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells
fossil