Metamorphic (Likely Gneiss Or Schist Based On Texture)

Likely weathered gray-green stone, possibly serpentinite

Serpentinite (predominantly serpentine-group minerals; identification uncertain from image)

White marble (likely calcitic marble)

Calcite-rich marble; primarily calcium carbonate, CaCO₃

Weathered mafic rock, likely basalt

Basalt; primarily plagioclase feldspar, clinopyroxene, and commonly olivine or magnetite

Sandstone with Liesegang Rings

Quartzose Sandstone with Iron Oxide Precipitation

River Cobble (Quartzite and Iron-stained Quartz)

Quartzite (SiO2 with iron oxide impurities)

Quartzite Cobble / Quartz River Pebble

Silicon Dioxide (SiO2) - Quartzite / Quartz

Dark mafic rock, likely basalt

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Blue Sapphire

Corundum (Al2O3)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

River Pebbles (Sandstone and Quartzite)

SiO2 (Quartz) dominated clastic rocks

Quartzite (River Pebble)

Quartzite (SiO2)

N/A (Non-Geological Specimen)

Porphyritic Rhyolite

Porphyritic Rhyolite (compositionally similar to granite)

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides (Goethite)

Sandstone

Arenite (SiO2 based with quartz, feldspar, or lithic fragments)

Porphyry

Porphyritic Igneous Rock (likely Porphyritic Andesite or Basalt)

Red Mudstone (Siltstone)

Lutite (primarily Quartz and Clay minerals with Hematite)

Granite

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

Stiped Slate Beach Pebble

Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)

Quartzite

Quartzite (SiO2)

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂); possibly quartzite, a recrystallized quartz sandstone

Porphyritic Basalt or Andesite

Porphyritic Basalt/Andesite

Aquamarine

Beryl (Be3Al2Si6O18) with trace Iron (Fe2+)

Quartzite (Iron-stained River Rock)

Metamorphic Rock consisting primarily of Quartz (SiO2)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (Mica)

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide), NaFe3Al6(BO3)3Si6O18(OH)4

Ruby

Corundum (Al2O3 with Chromium traces)

Gold Nugget

Native Gold (Au)

Quartz Vein in Metamorphic Rock

Quartzite or Schist host with Quartz (SiO2) intrusion

River Cobble (likely Basalt or Mafic Igneous Rock)

Extrusive Mafic Igneous Rock (e.g., Basalt)

Tumbled dark igneous rock, likely basalt

Basalt; commonly composed of plagioclase feldspar, pyroxene, and olivine

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Unidentified Rock Fragment

Unknown

Pink-and-white quartz-rich rock, likely rose quartz or quartzite

Quartz (SiO₂), possibly rose-quartz-bearing quartzite; minor iron-oxide staining

Black Tourmaline (Schorl)

Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)

Granite

Phaneritic Felsic Igneous Rock

Unknown Dark Stone

Unknown

Weathered basaltic volcanic rock

Likely vesicular basalt or basaltic-andesite; chiefly plagioclase, pyroxene, and iron-bearing minerals

Dark coarse-grained rock, likely basalt or gabbro

Basalt (fine-grained) or gabbro (coarse-grained), composed mainly of plagioclase feldspar and pyroxene

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

Pink Granite / Gneiss

Felsic Plutonic Rock (Granite) with Gneissic banding