Serpentinite (often called Jade or Nephrite substitute)
Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)
metamorphic
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Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (River Cobble)
Sandstone (principally composed of Quartz, SiO2)
sedimentary
Red Painted Rock
Artificial Coated Lithic Fragment
sedimentary
Jasper with Purple Fluorite or Chalcedony
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Shale
Shale (claystone/mudstone)
sedimentary
Copper Ore (Malachite and Limonite bearing rock)
Copper-bearing rock with secondary copper minerals
mineral
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Shale
Laminated Fissile Pelite
sedimentary
Rough turquoise-bearing rock (probable turquoise matrix)
Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, likely in a host-rock matrix
mineral
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Plutonic Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Polished brown mineral or rock fragment
Indeterminate from image; possibly iron-stained quartz, jasper, or a polished sulfide-bearing specimen
mineral
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Wishing Stone (Basalt/Metabasalt with Quartz-Feldspar Vein)
Veined Metabasalt / Veined Greywacke
metamorphic
Quartz Vein Rock
Silicon dioxide (SiO2) within a host rock matrix
mineral
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Coal (Bituminous / Anthracite)
Organic Sedimentary Rock (Carbonaceous Rock)
sedimentary
Dalmatian Jasper / Dalmatian Stone
Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Rounded quartz-veined pebble
Likely quartz-veined metamorphic rock; exact host rock is indeterminate from the image
metamorphic
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock (Felsic)
igneous
Quartz-rich chalcedony (likely silicified rock)
Microcrystalline quartz, SiO₂; possibly silicified limestone or jasper
mineral
Tiger Iron
Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)
metamorphic
Limonite (Ironstone Concretion)
Limonite: FeO(OH)·nH2O
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartz-veined Granite or Gneiss Pebble
Silicate-rich metamorphic rock fragment
metamorphic