Metamorphic Rock

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Slate

Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)

Slate

Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)

Unakite

Epidote-Feldspar rock (specifically, a variety of granite)

Pebble

Clast (specifically a granule or small pebble)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Greisen (Quartz-Muscovite-Turretine Rock)

Greisen

Banded Iron Formation

Banded Iron Formation (BIF)

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Bloodstone

Heliotrope (a variety of Chalcedony, SiO₂ with inclusions)

Serpentinite

Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)

Serpentine

Serpentinite (rock) containing serpentine minerals (e.g., Antigorite, Lizardite, Chrysotile)

Soapstone

Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Biotite Schist

Biotite Schist

Quartzite

Quartzite

Gneiss

Gneiss (pronounced 'nice')

Amphibolite with Hornblende

Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)

Banded Gneiss

Gneiss (pronounced "nice")

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)

Gneiss

Gneiss (high-grade metamorphic rock typically composed of quartz, feldspar, and mica)

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Grey Slate

Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)

White Jade (Nephrite)

Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2

Banded Gneiss

Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)

Unidentifiable Rock Fragment

Tiger's Eye

Silicon dioxide (SiO2) with fibrous inclusions of crocidolite

Green Aventurine

Silicon dioxide (SiO2) with fuchsite inclusions

Green Aventurine

Silicon Dioxide (SiO2) with inclusions

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Slate

Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)

Red Aventurine

Aventurine Quartz (SiO2 + Hematite/Goethite)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions