Mineral Health

Limonite (with goethite)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Limonite (Gozzany Iron)

Limonite (FeO(OH)·nH2O)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Limonite (Iron Ore)

Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O

Vanadinite on Barite

Pb5(VO4)3Cl (Vanadinite) with BaSO4 (Barite)

Diamond

Diamond (C)

Milky Quartz (with Chlorite/Mineral Inclusions)

Silicon Dioxide (SiO2)

Blue Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Scoria with Calcite Infills

Vesicular Basalt with secondary Calcification (CaCO3)

Fluorite Geode

Calcium Fluoride (CaF2)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Sandstone Concretion (Omar or Nut Rock)

Sedimentary Concretion (specifically an 'Omarolluk' or Omar)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Pegmatite with Schorl (Black Tourmaline) and Mica

Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Quartz / Quartzite

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Banded Gneiss (with possible weathered sulfide or iron staining)

Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides

Biotite Schist (likely)

Biotite Schist (rock), Biotite (mineral)

Gold in Matrix

Native Gold (Au)

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Rose Quartz

Silicon Dioxide (SiO2)

Amethyst Geode

Silicon Dioxide (SiO2) with iron impurities

Citrine

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Dyed Agate

Chalcedony (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Feldspathic Gneiss (Granite Gneiss)

Gneiss (High-grade Regional Metamorphic Rock)

Limonite (Yellow Ochre)

Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)

Gneiss

Gneiss (quartz-feldspar-biotite gneiss)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Fluorite

Calcium Fluoride (CaF2)

Yellow Aventurine

Quartz (Silicon Dioxide) with Mica inclusions (SiO2)

Sandstone with Iron Banding

Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)

Turquoise (likely stabilized or simulated Howlite)

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)

Malachite

Cu2CO3(OH)2 (Copper Hydroxide Carbonate)