Mineral (Processed Metal)

Blue Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Orange Calcite and White Calcite

Calcium Carbonate (CaCO3)

Quartz Druzy on Agate

Silicon Dioxide (SiO2)

Rainbow Obsidian

Volcanic Glass (SiO2 + impurities)

Smoky Quartz

Quartz (SiO₂)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Blue Quartzite (Dyed)

Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)

Porphyritic Basalt (or Andesite) containing Augite

Porphyritic Mafic Volcanic Rock

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Granite

Granite

Chert (Flint) Nodule

Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Ironstone Concretion / Hematite Nodules

Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))

Garnet-Mica Schist

Schist (variety with Almandine Garnet, Fe3Al2(SiO4)3)

Red Sandstone

Arenite (with Iron Oxide cement)

Echinoid Fossil (Commonly called a Sea Urchin or Heart Urchin)

Phylum Echinodermata, Class Echinoidea

Zebra Jasper

Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz

Quartzite (specifically an iron-stained or Carnelian-colored variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Slate

Foliated Metamorphic Rock (composed mainly of clay minerals or micas)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Green Banded Chert (Agate/Jasper)

Silicon Dioxide (SiO2) with trace impurities of Chlorite or Glauconite

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2) with iron inclusions

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Porphyritic Basalt

Porphyritic Basalt (with Plagioclase and Augite phenocrysts)

Fossilized Wood (with Coal and Limonite)

Petrified Wood (Silicified or Carbonized Flora)

Quartz in Matrix (or Quartz Vein Rock)

Silicon Dioxide (SiO2) with host rock

Desert Rose

Baryte or Gypsum variation (CaSO4·2H2O or BaSO4)

Gold Nugget

Native Gold (Au)

Malachite

Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)

Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)

Quartz (SiO₂)

Moss Agate

Silicon Dioxide with inclusions (SiO2)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron oxide inclusions)

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Blue Lace Agate

Chalcedony (SiO2) with trace minerals

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Turquoise

Turquoise (Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O)

Amygdaloidal Basalt

Amygdaloidal Basalt (with Epidote and Feldspar/Zeolite infill)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in Rhyolitic Matrix

Agate (Carnelian/Chalcedony)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Dyed Alum or Dyed Quartz (Ornamental Crystal)

Silicon Dioxide (SiO2) or Potassium Alum [KAl(SO4)2·12H2O]