Unknown (Likely Sedimentary Or Metamorphic)

Weathered brown rock, likely sandstone or iron-rich quartzite

Indeterminate; probable quartz-rich sandstone (quartz, feldspar, iron oxides)

Biotite-rich schist (probable)

Mica schist, rich in biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH,F)₂); exact identification is uncertain from the image alone.

Banded gneiss boulder

Gneiss; composition likely quartz, feldspar, and mica

Jasper (Red and Yellow)

Silicon Dioxide (SiO2) with iron oxide impurities

Quartz Vein in Hematitic Siltstone

Hydrothermal Quartz (SiO2) in Ferriferous Matrix

Quartz-rich pebble

Mostly quartz (SiO₂), possibly a quartzite or vein-quartz fragment

Pyrite (likely)

Pyrite, FeS₂

Banded gneiss

Gneiss, a foliated metamorphic rock; likely quartz–feldspar–mica gneiss

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Serpentinite (probable)

Serpentinite, dominated by serpentine-group minerals (chrysotile, lizardite, or antigorite), commonly with magnetite

Likely slate fragment

Slate; predominantly fine-grained mica/clay minerals and quartz

Mixed rock and mineral collection

Assorted geological specimens; individual species cannot be reliably identified from the image

Coarse-grained granite

Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Mica-rich metamorphic rock (likely mica schist)

Mica schist, composed mainly of muscovite and/or biotite with quartz and possibly feldspar

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Likely biotite-rich schist or gneiss

Mica schist (quartz–feldspar–biotite assemblage; exact identification requires examination)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Quartz-veined metamorphic rock, likely mica schist

Mica schist with a milky-quartz vein; predominantly quartz, feldspar, and biotite/muscovite mica

Weathered mica-rich rock fragment

Likely mica schist or phyllite; identification is uncertain from the image alone

Polished banded gneiss pebble

Gneiss, chiefly quartz–feldspar–mica; exact mineralogy uncertain from image

Weathered jasper or iron-stained quartzite

Silicified quartz-rich rock, primarily microcrystalline quartz (SiO₂) with iron-oxide/hydroxide staining

Likely biotite-rich schist

Mica schist, probably biotite–quartz–feldspar schist

Banded gneiss fragment

Gneiss, likely quartz–feldspar–mica gneiss

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Foliated metamorphic rock, likely gneiss or mica schist

Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph

Weathered fine-grained stone, likely sandstone or quartzite

Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂

Painted River Rock

Artificially Coated Sedimentary Rock

Quartz pebble with iron staining

SiO2

Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Porphyritic volcanic rock (likely andesite or basaltic andesite)

Porphyritic andesite/basaltic andesite; mainly plagioclase, pyroxene, and possibly olivine in a fine volcanic groundmass

Likely mica-rich metamorphic rock (schist)

Mica schist, probably biotite–muscovite schist; exact identification requires closer examination

Green Calcite

Calcium Carbonate (CaCO3)

Small dark metallic-looking rock fragment

Undetermined; possibly iron oxide-rich material or a metallic mineral

Milky quartz

Quartz, silicon dioxide (SiO₂)

Jasper with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Banded gneiss

Quartz–feldspar–mica gneiss; exact mineral composition cannot be confirmed from the image