Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Category
Metamorphic (Low Grade)
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Ferruginous Breccia
Breccia with Iron-rich (Hematite/Goethite) Matrix
sedimentary
Rough Quartz in Pegmatite Matrix
Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite
igneous
Limonite (Iron Stone)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Gossan (Iron Cap)
Limonitic Gossan (Fe2O3·nH2O mixed)
sedimentary
Chert (with Chalky Cortex)
Silicon Dioxide (SiO2)
sedimentary
White Jade / White Chalcedony
Nephrite Jade (Ca2(Mg,Fe)5Si8O22(OH)2) or Chalcedony (SiO2)
Mineral
Anthracite Coal
Anthracite
metamorphic
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite
mineral
Bull Quartz (Milky Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Coal (Anthracite or Bituminous)
Carbon (C) with varying hydrocarbon and mineral impurities
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Diamond (Uncut Crystal)
Carbon (C)
mineral
Jadeite
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Yellow Jade
Jadeite or Nephrite (NaAlSi2O6 or Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Rhodonite, Gray Moonstone, and White Feldspar Mix
Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
New Jade (Serpentine)
Antigorite / Serpentine group (Mg3Si2O5(OH)4)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Jadeite and Assorted Corundum (Ruby/Sapphire) / Beryl (Emerald)
Jadeite (NaAlSi2O6), Ruby/Sapphire (Al2O3), Emerald (Be3Al2(SiO3)6)
mineral
Anthracite
Anthracite coal
metamorphic
Biotite Schist
Biotite Schist (containing K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Amphibolite
Amphibolite (rich in amphibole and plagioclase feldspar)
metamorphic
Yellow Ocherous Siltstone (Limonitic Shale)
Limonitic Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Staurolite
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
River Cobble (Quartzite or Weathered Sandstone)
Arenite / Metasandstone (SiO2)
sedimentary
Prehnite
Ca2Al(AlSi3O10)(OH)2 (Calcium Aluminum Silicate hydroxide)
mineral
Basalt with Epidote (Greenstone)
Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)
igneous
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Whetstone (Arkansas Stone)
Novaculite (SiO2)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Bauxite
Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)
sedimentary
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Amethyst and Titanium Treated Druzy
Silicon Dioxide (SiO2) with trace impurities including Iron
mineral
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
mineral
Ferruginous Sandstone (Gozzan/Ironstone)
Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)
sedimentary