Sedimentary Or Metamorphic (Base Substrate)

Gneiss

Metamorphic Gneiss

River Stone (Basalt or Siltstone)

Basalt (extrusive igneous rock) or fine-grained Siltstone

Granite Pebble (River Rock)

Phaneritic Felsic Igneous Rock

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Gneiss Pebble

Orthogneiss / Paragneiss

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Gneiss (Metamorphic Pebble)

Metamorphic Rock (Quartz-Feldspar-Biotite Gneiss)

Amethyst and Calcite collection

Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)

Dark rounded pebble

Likely basalt or another fine-grained mafic volcanic rock; exact identification is uncertain from the image

Pink Quartzite Pebble

Quartzite (SiO2)

Likely biotite-rich schist

Mica schist, probably containing biotite and quartz (exact identification requires testing)

White Quartz Pebbles

Silicon Dioxide (SiO2)

River Pebble (Grantoid/Quartzite)

Quartz-rich igneous rock (Granitoid)

Lava Rock (Basaltic Scoria)

Vesicular Basalt

Mixed mineral and rock collection

Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones

Anthracite Coal

Anthracite (Carbon-based metamorphic rock)

Blue dyed mineral or stone fragment (identity uncertain)

Not reliably identifiable from the image; possibly dyed quartz or another porous stone

Dragon Blood Jasper

Epidote with Red Piedmontite (Chalcedony/Quartz variant)

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Gneiss (Augen Gneiss)

Augen Gneiss

Gneiss (River Cobble)

Gneiss

Gold Mineral

Native Gold (Au)

Gneiss

Gneiss

Chert with Asphaltum (or Tar)

Silica (SiO2) with natural Bitumen/Asphaltum

Gneiss

Gneiss (Foliated Metamorphic Rock)

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Probable mica schist

Schist, likely muscovite–biotite schist

Pyrite-bearing schist (likely mica schist)

Muscovite–quartz schist with disseminated pyrite (FeS₂)

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Granitoid Gneiss with Feldspar Vein

Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)

White Agate / Chalcedony

Silicon Dioxide (SiO2)

Mica

Phyllosilicate group (e.g., Biotite or Muscovite)

Titanium Quartz (Aura Quartz)

Silicon Dioxide (SiO2) treated with Titanium

Graphite

Graphite (C)

Mineral and rock specimen collection

Assorted geological materials, including amethyst, agate, azurite, calcite, feldspar, garnet, jasper, malachite, pyrite, quartz varieties, and others

Light-colored pebble, likely quartzite or weathered limestone

Indeterminate from image; possible quartzite (microcrystalline SiO₂)

Slate with Quartz Vein

Metamorphic pelitic rock with hydrothermal quartz vein

Limonite or Goethite (Ironstone)

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

Gneiss

Gneiss

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Anthracite Coal

Anthracite (Carbon-based sedimentary-metamorphic rock)

Gravel / Crushed Stone

Aggregate (mixed mineral rock fragments)