Metamorphic Rock (Composed Of Multiple Minerals)

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Quartzite River Cobble

Quartzite (primarily SiO2)

Felsic Igneous Rock (likely Rhyolite or weathered Granite)

Felsic Volcanic/Plutonic Rock

Diorite

Intermediate plutonic igneous rock

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Petrified Wood

Silicified Wood (primarily Chalcedony or Quartz, SiO2)

Nephrite Jade / Pounamu

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

Basalt

Mafic volcanic rock (various silicate minerals including Pyroxene and Plagioclase)

Desert Rose

Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O) or Barite (Barium Sulfate, BaSO4)

Ironstone (Limonitic Concretion)

Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Staurolite

Staurolite (Fe2+2Al9Si4O23(OH))

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

Vesicular Basalt

Basalt with secondary mineral infilling (Amygdaloidal Basalt)

Quartz / Quartzite

Quartz (Silicon Dioxide, SiO2)

Blue Quartzite (Dyed)

Silicon Dioxide (SiO2) with inclusions

Petrified Wood

Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)

Burmese Jadeite (Water Jade)

Jadeite (NaAlSi2O6)

Yellow Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Diamond (Faceted)

Carbon (C) - Diamond

Diamond

Native Carbon (C)

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Blue Chalcedony

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Fe3O4)

Fossil Coral

Fossilized Scleractinia or Tabulata (various genera/species)

Red Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)

Quartzite Pebble

Metamorphic Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Granite

Phaneritic Igneous Rock (Granite)

Coal (most likely Bituminous or Anthracite)

Coal (primarily composed of carbon with varying amounts of other elements)

Red Sandstone

Arenite (Ferruginous Sandstone)

Granite

Intrusive Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Quartzite

Quartzite (SiO2)

Vesicular Basalt (Amygdaloidal)

Vesicular Basalt (Fe-Mg rich extrusive volcanic rock)

Noble Serpentine

Antigorite (Mg3Si2O5(OH)4)

Pink Granite

Phaneritic Plutonic Felsic Rock (Granite)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Jasper

Silicon dioxide (SiO2) with impurities

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)