Mineral (Tectosilicate)

Unidentified dark metallic sulfide specimen

Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing

Fluorite (Fluor-spar)

Calcium Fluoride (CaF2)

Fluorite with Quartz

Fluorite (CaF2) and Quartz (SiO2)

Quartz and Mixed Minerals

Silicon Dioxide (SiO2)

Quartz with Associated Minerals

Silicon Dioxide (SiO2)

Quartz in Limonite-rich Matrix

Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O

Green schist

Chlorite–mica schist, likely containing quartz and feldspar

Tumbled green stone, possibly serpentine

Likely serpentine-group rock (mainly serpentine minerals; identification uncertain from the image)

Dark green schist (probable chlorite/actinolite schist)

Chlorite–actinolite schist; exact mineral identification requires testing

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)•nH2O

Polished blue copper mineral, likely chrysocolla or dyed howlite

Chrysocolla: hydrated copper phyllosilicate, approximately (Cu,Al)₂H₂Si₂O₅(OH)₄·nH₂O; visual identification is uncertain from the image

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Banded Gneiss (Variety of Gneiss)

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

Blue sodalite (likely)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Gneiss

Gneiss (Metamorphic Rock)

Amygdaloidal Basalt

Mafic extrusive igneous rock with secondary mineral infills

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Polished granite or gneiss stone

Granite, chiefly quartz, feldspar, and dark mica/amphibole; exact identification is uncertain from the photograph

Fossilized Gastropod / Coral

Phylum Mollusca / Cnidaria (Silicified or Calcified)

Magnetite

Fe3O4 (Iron(II,III) oxide)

Aquamarine with Muscovite

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Muscovite Mica

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)•nH2O

Selentite

Gypsum (CaSO4 · 2H2O)

Limonite

FeO(OH)•nH2O

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂), likely milky or druzy quartz

Hematite

Hematite (Fe2O3)

Gypsum

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Lepidolite

K(Li,Al)3(Al,Si,3O10)(F,OH)2

Galena with Quartz

Lead sulfide (PbS) associated with Silicon dioxide (SiO2)

Sulfur

Native Sulfur (S)

K-Feldspar

Potassium Feldspar (KAlSi3O8)

Feldspar

Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Kyanite

Al2SiO5

Halite

Sodium Chloride (NaCl)

Pyrite

Iron Sulfide (FeS2)