Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Mineral
Category
Not A Natural Rock (Man Made Composite)
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Pink Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
sedimentary
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2
metamorphic
Tektite (Indochinite)
Tektite (Amorphous silica glass, SiO2 with impurities)
meteorite
River Stone (likely Basalt or Chert)
Silicon Dioxide (SiO2) for chert or Mafic Extrusive Rock for basalt
igneous/sedimentary
Quartz (Smoky/Druzy variety)
Silicon Dioxide (SiO2)
mineral
Rounded gray river pebble, likely basalt or andesite
Fine-grained mafic volcanic rock; commonly basalt (plagioclase, pyroxene, ± olivine)
igneous
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Turquoise cabochon
Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)
gemstone
Pumice
Pumice (a highly vesicular volcanic rock)
igneous
Chert
Chert (microcrystalline quartz)
sedimentary
Limestone (Porous/Travertine variant)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Pearls
Pearl: biomineralized aragonite (CaCO₃) and conchiolin
gemstone
Polished red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Obsidian
Volcanic glass
igneous
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
mineral
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Dyed Pink Quartzite (Jadeite Simulant)
Silicon Dioxide (SiO2) with organic dye
metamorphic
Granite
Phaneritic intrusive igneous rock (Composition: Quartz, Feldspar, Mica)
igneous
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
sedimentary
Glauconite (Green Sandstone)
Glauconite (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
sedimentary
Dyed Agate Geode Slice
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Polished dark stone, likely basalt
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine
igneous
Ironstone Concretion / Goethite-Hematite Nodule
Goethite/Hematite (α-FeO(OH) / Fe2O3)
sedimentary
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
River Quartzite Siltstone
Quartz-rich Meta-siltstone (SiO2 dominated)
metamorphic
Vesicular Basalt / Scoria (with Iron Oxide Alteration)
Vesicular Basalt
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Milky Quartz Geode / Chalcedony Nodule
Quartz (Silicon Dioxide - SiO2)
mineral
Tumbled sodalite with white calcite veining
Sodalite, Na8(Al6Si6O24)Cl2, commonly intergrown with calcite, CaCO3
mineral
Granite
Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)
igneous
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Hag Stone
Perforated Sedimentary Rock (typically Flint or Limestone)
sedimentary
Granite
Phaneritic Plutonic Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Porphyritic Rhyolite
Porphyritic Rhyolite (Felsic volcanic rock)
igneous
Sandstone (Weathered)
Arenite (typically SiO2 as quartz grains)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (compositionally various, primarily SiO2)
sedimentary