Green Jasper / Green Quartz
Silicon dioxide (SiO2) with mineral impurities
sedimentary
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Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Ammonite Fossil
Ammonoidea
fossil
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Agate
Silicon dioxide (Chalcedony variety)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Red Jasper
Silicon Dioxide (SiO2), microcrystalline quartz variety
sedimentary
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Green Aventurine
SiO2
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Amethyst
SiO2 (Silicon Dioxide with Fe3+ impurities)
mineral
Jasper
Cryptocrystalline quartz (SiO2)
Sedimentary/Mineral
Sea Glass
Amorphous silicon dioxide (glass)
mineral
Chert
Chert (Microcrystalline Quartz)
sedimentary
Basalt
Basalt
igneous
Quartzite pebble
Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert
Silicon dioxide (SiO2)
Sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcite (CaCO3)
mineral
Sandstone Pebble
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Picasso Stone
Metamorphic Limestone (Marble)
metamorphic
Chert (Cherty Shale / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sea Glass
Amorphous Silica (Glass) SiO2
Mineraloid (Man-made origin)
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Synthetic Marbled Aggregate (Footwear Component)
Ethylene-vinyl acetate (Croslite™)
not a rock (man-made polymer)
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Asphalt (Bituminous Concrete)
Composite material (bitumen binder with mineral aggregate)
man-made rock (technosol)