Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Category
Man Made Rock (Sedimentary Analogue)
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Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary
Fossil Snail
Gastropoda fossil
fossil
Granite
Felsic intrusive igneous rock
igneous
Quartz Geode in Sedimentary Host Rock
Silicon Dioxide (SiO2) in Carbonate Matrix
sedimentary
Geode
Quartz / Chalcedony nodule
sedimentary
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Mudstone
Lutylite (group of fine-grained sedimentary rocks)
sedimentary
Dalmatian Stone
Aplite (often incorrectly called Dalmatian Jasper)
igneous
Granite Cobble/Pebble
Granite
Igneous
Lapis Lazuli
Lapis Lazuli (Complex rock consisting primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2)
metamorphic
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Shale (Ferruginous)
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Starfish Fossil
Asteroidea fossil
fossil
Petrified Wood
Silicified Wood (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Seashell (Calcium Carbonate)
Calcium Carbonate (CaCO3)
mineral
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Megalodon Shark Tooth
Otodus megalodon
fossil
Likely weathered gneiss
Foliated metamorphic rock, commonly quartz–feldspar–mica gneiss
metamorphic
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Green Banded Chert (Agate/Jasper)
Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite
sedimentary
Chert (Flint variety)
Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2
sedimentary
Banded Sedimentary Rock
Sedimentary rock with Liesegang banding
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Smooth river pebble
Indeterminate lithology; likely fine-grained quartz-rich sandstone, siltstone, or weathered chert
sedimentary
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Red Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Antropogenic (Man-made material)
Quartz (Engineered Quartz Surface)
Silicon Dioxide (SiO2) based composite
mineral (man-made composite)
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Sandstone (Pebble)
Arenite
sedimentary
Banded Sedimentary Rock
Sedimentary rock with mineral veins/banding
sedimentary
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Sandstone (lithic)
Lithic Wacke / Arenite
sedimentary