Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)

Dendritic Agate

Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2 with FeO(OH) impurities)

Quartzite

Quartzite (SiO2)

Rough Diamond

Diamond (C)

Rhodochrosite

Manganese carbonate (MnCO3)

Limestone (specifically Travertine or Tufa)

Calcium Carbonate (CaCO3)

Quartzite with Chlorite

Metamosphosed Quartz Sandstone (SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2 inclusions)

Sandstone

Arenite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Pink Halite (Himalayan Salt)

Halite (Sodium Chloride, NaCl)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Quartzite pebble

Quartzite (SiO2)

Fluorite Tower

Calcium Fluoride (CaF2)

Quartzite

Quartzite (primarily Silicon Dioxide, SiO2)

Quartzite Pebble

Metamorphic Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Pink Rhodonite

Manganese Silicate (MnSiO3)

Quartzite (Gold/Yellow)

Quartzite (SiO2)

Dendritic Agate or Spotted Quartzite

Silicon Dioxide (SiO2) with inclusions

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil

Rainbow Fluorite

Calcium Fluoride (CaF2)

Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe oxides)

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 impurities)

Milky Quartz

Silicon Dioxide (SiO2)

Sodalite

Sodalite Na8(Al6Si6O24)Cl2

Quartzite

Quartzite (predominantly SiO2)

Yellow Quartz Pebble

SiO2 (Silicon Dioxide)

Rhodonite in Quartz Matrix

Rhodonite (Manganese Iron Magnesium Calcium Silicate - Mn,Fe,Mg,Ca)SiO3

Lunar Meteorite (Feldspathic Breccia)

Lunar Achondrite (Regolith Breccia)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Quartz (Quartzite Pebble)

Silicon Dioxide (SiO2)

Sandstone (with biological crust)

Arenite (SiO2 based)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Carnelian (Red Chalcedony)

Silicon Dioxide (SiO2)

Fluorite

Fluorite (Calcium Fluoride - CaF2)

White Jade (Nephrite)

Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2

Rhodochrosite

Manganese carbonate (MnCO3)