Mineral, Specifically An Iron Ore

Fossil Shark Tooth (Otodus obliquus)

Otodus obliquus; hydroxyapatite (mineralized form Ca5(PO4)3(OH))

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Chert (specifically White Chert or Novaculite)

Silicon Dioxide (SiO₂)

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Green Moonstone (Garnierite)

Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)

Chert (specifically Yellow or River Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Azurite and Malachite on Matrix

Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2

Peridotite

Peridotite (Ultramafic Rock)

Olivine (likely Peridot variety)

Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4

Greenstone

Greenschist / Greenstone (contains epidote, chlorite, and actinolite)

Fluorite

Calcium Fluoride (CaF2)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Metasedimentary or Igneous matrix

Labradorite (specifically Larvikite beads)

Plagioclase Feldspar (Na,Ca)(Si,Al)4O8

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Bicolor Tanzanite

Zoisite (Ca2Al3(SiO4)3(OH))

Bumblebee Jasper

Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Smoky Quartz

Silicon Dioxide (SiO2)

Imperial Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz with Mineral Inclusions

Bauxite

Bauxite (Al2O3·nH2O)

Chert (specifically Yellow or Brown Chert / Jasper)

Silicon Dioxide (SiO2)

Malachite

Copper Carbonate Hydroxide [Cu2CO3(OH)2]

Clear Quartz

Silicon Dioxide (SiO2)

Chert (Tripolitic Chert / Flint Nodules)

Microcrystalline Quartz (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

Beryl (Aquamarine)

Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)

Rhodonite

Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3

Tiger's Eye (specifically Blue Tiger's Eye / Falcon's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Banded Agate (Onyx variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartzite (specifically a river-worn pebble)

Quartzite (primarily SiO2)

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Uraninite (Pitchblende)

Uranium dioxide (UO2)

Arid Sandy Loam

Arenosols / Regosols

Green Calcite

Calcite (CaCO3)

Fossilized Angel Wing Shell

Cyrtopleura costata

Malachite

Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)

Milky Quartz

Silicon Dioxide (SiO2)