Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Synthetic (Not A Natural Rock)
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Petoskey Stone
Hexagonaria percarinata
sedimentary
Blue Dyed Agate Geode (Slice)
Silicon Dioxide (SiO2) - Chalcedony / Quartz
mineral
Dark volcanic sand / basaltic sand
Basalt-derived lithic sand, chiefly plagioclase, pyroxene, and volcanic glass
igneous
Smoky Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Sandstone (Stream-rounded Cobble)
Arenite (composed primarily of SiO2, Silica)
sedimentary
Pumice
Pumice (a vesicular volcanic glass)
igneous
Flagstone (Sandstone)
Sandstone (Silicon Dioxide with variations of Iron Oxide/Calcium Carbonate)
sedimentary
Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Sandstone (Pebble)
Arenite (primarily SiO2)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Vuggy Limestone
Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)
sedimentary
Red Granite
Granite (Felsic intrusive igneous rock)
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Yellow quartz, possibly citrine
Quartz (SiO₂), yellow variety likely citrine; may also be iron-stained quartz
mineral
Granite
Intrusive Igneous Rock (Granitic)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Scoria (Lava Rock)
Scoria (vesicular basaltic rock)
igneous
Blue Sapphire
Corundum (Al2O3)
mineral
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Turquoise in Matrix
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Liesegang Rings (in Sandstone or Siltstone)
Ferruginous Sandstone with Liesegang Banding
sedimentary
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Gabbro Pebble (Polished Beach/River Stone)
Gabbro
igneous
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Beach Pebbles and Jasper
Quartz / Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (predominantly SiO2)
metamorphic
Red Sandstone
Quartzose Sandstone (SiO2)
sedimentary
Diorite with Weathering Rind
Course-grained intermediate plutonic rock (Diorite)
igneous
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
Mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Sandstone
Arenite (CaCO3/SiO2 cemented quartz)
sedimentary
Pumice
Pumice (Volcanic Rock)
igneous
Agate (specifically Chalcedony nodule)
Silicon Dioxide (SiO2)
mineral