Man Made Byproduct (Often Mistaken For Obsidian Or Emerald)

Sandstone

Arenite

Sandstone (Ferruginous)

Arenite (Fe2O3 enriched)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Serpentine

Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4

Granite

Granite (Felsic Plutonic Rock)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2 prominent)

Sandstone (likely Arkose)

Arenite (Feldspathic Sandstone / Arkose)

Green Fluorite

Calcium Fluoride (CaF2)

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Quartz / Common Opal

Silicon Dioxide (SiO2)

Rhodonite

Rhodonite (Mn2+SiO3)

Rose Quartz

Silicon dioxide (SiO2)

Shale with Pyrite

Clastic sedimentary rock containing Iron Disulfide (FeS2)

Celestine (or Celestite) on Matrix

Celestine (SrSO4)

Quartzite

Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (primarily SiO2)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Petrified Wood

Silicified Wood (primarily SiO2)

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Sandstone (likely Quartzose type)

Clastic sedimentary rock (primarily SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Olivine (Peridotite)

Magnesium iron silicate (Mg, Fe)2SiO4

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Quartz (Pink/Orange Variety)

Silicon Dioxide (SiO2)

Fluorite

Calcium fluoride (CaF2)

Milky Quartz

Silicon Dioxide (SiO2)

Citrine Quartz Sphere

Silicon Dioxide (SiO2)

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone (likely Iron-rich or Arkosic)

Arenite (SiO2 with FeO(OH) or Fe2O3 staining)

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Rhodochrosite with Pyrite and Quartz

Manganese Carbonate (MnCO3)

Green Aura Quartz (Titanium treated Kyanite or Quartz)

Silicon Dioxide (SiO2) or Aluminum Silicate (Al2SiO5) with Titanium/Metal Oxide coating

Limonite / Ironstone Nodule

Limonite (Hydrated iron(III) oxide-hydroxide), FeO(OH)·nH2O

Iron-Nickel Meteorite fragment

Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))