Metamorphic Or Sedimentary Depending On Local Grade

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Probable tumbled garnet

Garnet-group silicate, commonly almandine (Fe₃Al₂Si₃O₁₂)

Clear Quartz (Faceted) / White Sapphire / Goshenite

Silicon Dioxide (SiO2) / Aluminium Oxide (Al2O3)

Banded River Rock / Gneiss (highly weathered)

Gneiss

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic inclusions

Likely fossil oyster shell

Fossilized bivalve shell; exact species cannot be identified from the image

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Moqui Marry / Shaman Stone

Hematite-cemented Sandstone Concretion

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8) with inclusions

Dark green mineral specimen, possibly serpentine or epidote

Tentatively serpentine-group mineral, Mg₃Si₂O₅(OH)₄, or epidote, Ca₂(Al,Fe)₃Si₃O₁₂(OH)

Banded Gneiss or Migmatite Pebble

Gneiss / Migmatite

Small pink-red mineral fragment, possibly ruby or corundum

Corundum (Al₂O₃), unconfirmed; visual identification is uncertain

Gneiss

Gneiss (High-grade metamorphic rock)

Smoky Quartz

Silicon dioxide (SiO2)

Polished dark stone fragment, possibly slate or schist

Fine-grained foliated metamorphic rock; exact mineral composition is indeterminate from the image

Biotite schist with quartz–feldspar-rich inclusion

Mica schist, primarily biotite mica (黒雲母) with quartz and feldspar

Weathered greenstone (likely serpentinite or altered basalt)

Serpentinite-group rock, commonly dominated by serpentine minerals (antigorite/lizardite); exact identification requires testing

Crystalline limestone (marble-like calcite rock)

Calcite, CaCO₃; likely recrystallized limestone (marble)

Garnet (Red Garnet)

Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).

Rough Ruby (Corundum) in Zoisite Matrix

Al2O3 (Aluminum Oxide) with Ca2Al3(SiO4)3(OH)

Banded Gneiss

Metamorphic Gneiss

Aura Quartz Bead

Silicon dioxide (SiO2) with metal coating

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Schist (containing Muscovite Mica and Chlorite)

Mica Schist

Orthoclase Feldspar (Salmon variety)

Orthoclase, KAlSi3O8

Gneiss

Gneiss (High-grade metamorphic rock)

Slate

Slate; fine-grained metamorphosed shale, chiefly quartz, mica, and clay minerals

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Rounded quartz-rich pebble, likely sandstone or granitic-derived pebble

Indeterminate clastic rock; likely quartz-rich sandstone/conglomerate clast

Green Calcite

Calcium Carbonate (CaCO3)

Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss)

Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole

Gneiss

Gneiss (High-grade metamorphic rock)

Garden Pebble (Quartzite or Limestone fragment)

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) fragment

Fossilized shell or bone fragment

Likely bioclast composed mainly of calcium carbonate (calcite/aragonite); exact organism is indeterminate from the image

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Foliated Metamorphic Rock

Tumbled greenish stone, possibly serpentine or weathered quartzite

Tentative: serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Hornblende-bearing metamorphic rock (probable amphibolite)

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

Galena

Lead Sulfide (PbS)

Chert Conglomerate (Potomac Puddle Stone)

Sedimentary Conglomerate with Iron-Oxide matrix