Mineral (Metamorphic Pseudomorph)

Greenstone (likely metamorphosed basalt)

Metabasalt/greenstone; commonly composed of chlorite, actinolite, epidote, albite, and quartz

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Acid-treated Chalcopyrite (CuFeS2)

Unidentified gray-green rock specimen

Possibly banded gneiss or another foliated metamorphic rock; identification is uncertain from the image

Magnetite

Fe3O4 (Iron(II,III) oxide)

Greenstone / epidote–chlorite schist (tentative)

Epidote–chlorite schist, likely containing actinolite and quartz/feldspar

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite or other green mica inclusions

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Blue Aventurine

Quartz (SiO2) with inclusions

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss (Metamorphosed Granitic Rock)

Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)

Marble

Metamorphic Limestone (CaCO3)

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Yellow Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Pyrite

Iron Disulfide (FeS2)

Optical Calcite

Calcium Carbonate (CaCO3)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Banded gneiss

Gneiss, commonly quartz–feldspar–biotite gneiss

Greenschist

Greenschist (Chlorite-actinolite schist)

Banded gneiss

Foliated gneiss, likely quartz–feldspar–mica gneiss

Banded metamorphic rock, likely gneiss or schist

Foliated quartz–feldspar–mica rock; exact identification requires a closer view or mineral testing

Dark metamorphic rock, likely schist or gneiss

Mica schist/gneiss; commonly quartz + feldspar + biotite, with possible amphibole

Foliated metamorphic rock, likely mica schist

Mica schist, mainly quartz–feldspar–mica assemblage

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Greenstone

Metabasalt / Chlorite-actinolite-epidote schist

Banded gneiss (likely orthogneiss or paragneiss)

Gneiss; composition commonly quartz + feldspar + mica, with possible amphibole/biotite

Tumbled banded gneiss or amphibolite

Banded metamorphic rock, likely quartz–feldspar–biotite gneiss with amphibole

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Vein-bearing metamorphic rock, likely gneiss or schist

Banded silicate rock; likely quartz–feldspar–mica gneiss with a quartz vein

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

Prehnite

Ca2Al(AlSi3O10)(OH)2

Clear Quartz

Silicon Dioxide (SiO2)

Greenschist

Chlorite schist

Wavellite with Quartz

Al3(PO4)2(OH,F)3 & SiO2

Weathered metamorphic pebble, likely greenstone

Probable greenschist or chlorite-rich metabasalt; exact identification requires testing

White marble (likely calcitic marble)

Calcite-rich marble; primarily calcium carbonate, CaCO₃

Likely banded metamorphic rock, possibly schist or gneiss

Micaceous schist/gneiss; identification is limited from the photograph