Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)

Obsidian (Gold Sheen)

Obsidian (SiO2 + impurities)

Granite

Phaneritic Acidic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Laterite (iron-rich nodule, possibly Bauxite as a subtype)

Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)

Granodiorite

Phaneritic-textured Intrusive Granodiorite

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Serpentine

Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Ironstone with Pyrite

Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)

Schist

Schist (various mineral compositions)

Granite

Granite (Phaneritic intrusive igneous rock)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Pyrite

Iron Sulfide (FeS2)

Granitoid (Granite/Granodiorite)

Plutonic igneous rock (variable composition, primarily SiO2)

Biotite on Matrix

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Mica Schist

Crystalline Schist (often primarily Muscovite or Biotite sheet silicates)

Fluorite (often referred to as Rainbow Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Turquoise

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

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)

Quartz Crystal (specifically Rock Crystal)

Silicon Dioxide (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz - SiO2)

Magnetite

Magnetite (Fe3O4)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz (Milky or Cloudy Quartz)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Sandstone (specifically Arkose or Ferruginous Sandstone)

Sandstone (SiO2 with iron oxide inclusions)

Milky Quartz

Milky Quartz (Silicon Dioxide, SiO2)

River Agate (Chert/Chalcedony)

Cryptocrystalline Quartz (SiO2)

Lavender Quartz (appearing as beads) and Druzy Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (Rough Specimen)

Silicon Dioxide (SiO2)

Banded Agate (specifically Chalcedony nodule)

Agate (Silicon Dioxide, SiO2)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Banded Sandstone

Arenite (composed primarily of Quartz: SiO2)

Greenstone

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

Greenstone (Greenschist)

Greenschist (composed of Chlorite, Epidote, and Actinolite)

Sandstone (Quartzite-rich Pebble)

Arenite (primarily SiO2)

Basalt

Mafic Igneous Rock

Amethyst

Amethyst (Silicon Dioxide - SiO2 with impurities of iron)

Chert (Flint)

Chert (SiO2)

Mica Schist

Mica Schist (Intermediate-grade Metamorphic Rock)