Pink Dyed Agate
Silicon Dioxide (SiO2) with synthetic pigment
mineral
Category
Not A Natural Rock (Man Made Composite)
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Diorite
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Fossilized coral (likely honeycomb or branching coral)
Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃
fossil
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Shale
Shale (Consolidated fine-grained clay/silt)
sedimentary
Breccia
Breccia (Clastic sedimentary rock)
sedimentary
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2)
metamorphic
Weathered sandstone pebble
Clastic sandstone, predominantly quartz (SiO₂) grains cemented by silica, calcite, or iron oxides
sedimentary
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Beryl (Emerald variety in host rock)
Be3Al2(SiO3)6 (Silicate mineral)
mineral
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Scoria
Vesicular Basalt / Scoria
igneous
Smoky Quartz
Smoky Quartz (SiO2)
Mineral
Conglomeratic sandstone or breccia
Lithic arkose / polymictic conglomeratic sandstone
sedimentary
Blue Banded Agate (Dyed)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Granite
Phaneritic Plutonic Felsic Rock
igneous
River Quartz (Milky and Smoky mix)
Silicon Dioxide (SiO2)
mineral
Carnelian Beads
Silicon Dioxide (Variety of Chalcedony), $SiO_2$
gemstone
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Marble
Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.
Metamorphic Rock
Sea Glass
Amorphous Silica (Glass) SiO2
Mineraloid (Man-made origin)
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Sea Glass (Cobalt Blue)
Amorphous Silica (Glass with Cobalt additives)
Anthropogenic specimen (man-made)
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Greenstone (Celadonite-bearing Volcanic)
Hydrothermally altered basalt or andesite with Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
mineral
Wonderstone (Sandstone)
Liesegang Banded Sandstone (SiO2 dominated)
sedimentary
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Diorite (Spotted or Dalmatian Stone effect)
Diorite (Intermediate Plutonic Rock)
igneous
Clear Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Chert (Green and Black Jasper variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Scoria (Lava Rock)
Scoria (Extrusive Igneous Rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Herkimer Diamond
Quartz (SiO2)
mineral
Amethyst Geodes
Silicon Dioxide (Quartz with Iron impurities), SiO2
mineral
Amethyst
Crystalline Silicon Dioxide with iron impurities (SiO2)
gemstone
Clear Quartz
SiO2 (Silicon Dioxide)
mineral
Sandstone
Arenite (lithic or quartz sandstone)
sedimentary
Brecciated jasper (likely red-and-cream jasper)
Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining
gemstone