Likely weathered gneiss or mica-rich schist
Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist
metamorphic
Category
Metamorphic (Modified)
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Amphibolite / Hornblende Schist
Amphibolite
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Greenschist
Chlorite schist
metamorphic
Gneiss (Augen Gneiss)
Augen Gneiss
metamorphic
Greenschist
Chlorite schist
metamorphic
Tiger Iron
Tiger Iron (Hematite, Red Jasper, and Tiger's Eye)
metamorphic
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Mica Schist with Garnet inclusions
Mica Schist (primarily Muscovite and Biotite - KAl2(AlSi3O10)(OH)2)
metamorphic
Greenschist
Greenschist facies metamorphic rock
metamorphic
Garnet Schist
Almandine-Mica Schist
metamorphic
Greenschist
Chlorite schist
metamorphic
Travertine
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Greenschist (Greenstone)
Chlorite Schist / Greenschist Facies Rock
metamorphic
Biotite Schist
Biotite Schist
metamorphic
Garnet (Almandine variety)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Banded Gneiss / Metamorphic River Pebble
Gneiss (Foliated Metamorphic Rock)
metamorphic
Soapstone (steatite), possibly talc-rich schist
Steatite; predominantly talc, Mg₃Si₄O₁₀(OH)₂, with possible chlorite, mica, and carbonates
metamorphic
Quartz with Mica/Host Rock
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Epidotite
Epidotite (Epidote content > 50%)
metamorphic
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Basalt Pebble
Extrusive Igneous Rock
igneous
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist, possibly with quartz and feldspar
metamorphic
Dark gray foliated metamorphic rock, likely slate or phyllite
Slate/phyllite; commonly quartz, muscovite/illite, chlorite, and graphite or carbonaceous matter
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Gneiss (Metamorphic Pebble)
Gneiss (SiO2-rich metamorphic rock)
metamorphic
Garnet amphibolite / Metamorphic Rock
Garnet Amphibolite (Hornblende - Almandine schist/gneiss)
metamorphic
Tiger iron slab (likely polished banded iron formation)
Banded iron formation (BIF), chiefly hematite/magnetite, quartz, and iron-rich amphibole or jasper
metamorphic
Quartzite
Quartzite
Metamorphic
Epidote with Quartz
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Mica Schist
Mica Schist
metamorphic
Epidote
Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite)
metamorphic
Slate
Slate (foliated metamorphic rock)
metamorphic
Garnet
Group of silicate minerals (e.g., Almandine: Fe3Al2(SiO4)3)
gemstone
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
gemstone
Lapis Lazuli
(Na,Ca)8(Al,Si)12O24(S,SO4)(Cl)2
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Magnetite / Hematite (Iron Ore)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Unakite
Epidotized Granite
metamorphic