Sapphire
Corundum (Al2O3)
gemstone
Category
Anthropogenic (Man Made Material)
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Rhodochrosite
Rhodochrosite, Manganese Carbonate (MnCO3)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Diamond
C (Carbon)
mineral
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Petrified Wood
Silicified Wood (primarily SiO2 - Silicon Dioxide)
sedimentary
Likely weathered quartz-rich stone
Probably quartz-bearing sandstone or milky quartz; exact identification requires testing
mineral
Basalt River Pebble
Basalt
igneous
Diamond (or Simulant)
Carbon (C)
gemstone
Diamond (Faceted)
Carbon (C)
gemstone
Basalt (River Pebble)
Basalt
igneous
Diamond
C (Carbon)
mineral
Granite Sand and Gravel Mix
Phaneritic Felsic Igneous Plutonic Assemblage
igneous
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Vein in Sandstone
Quartz (SiO2) in Clastic Sedimentary Rock
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Chert (Field-collected variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Unidentified dark reddish-brown rock or mineral specimen
Indeterminate from the blurred image; possibly iron-stained quartz, jasper, or a metallic sulfide-bearing rock
mineral
Chert or flint with chalcedony/quartz veins
Microcrystalline silica: primarily quartz (SiO₂), including chalcedony; possible fossiliferous limestone or silicified material
sedimentary
Coarse-grained Granite or Gneiss
Granitic intrusive rock
igneous
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Blue topaz (likely treated)
Topaz, Al₂SiO₄(F,OH)₂
gemstone
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Quartzose)
Sandstone (composed primarily of Quartz: SiO2)
sedimentary
Crushed Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Black Jasper (Etched)
Silicon Dioxide (SiO2) with impurities
mineral
Tumbled carnelian/chalcedony
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite Pebble
Felsic Igneous Rock (Granitic composition)
igneous
Jasper (Banded Argillite/Chert mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Amorphous SiO2 + Cristobalite)
igneous
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Greenish translucent mineral fragment
Indeterminate; possibly serpentine, epidote, or green glassy feldspar
mineral
Red jasper / iron-rich chert
Microcrystalline quartz (SiO₂) colored by hematite/goethite
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Rose quartz (polished fragment)
Quartz, silicon dioxide (SiO₂), pink variety
mineral