Mineral Variant

Epidote

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

K-Feldspar (Potassium Feldspar)

Orthoclase / Microcline (KAlSi3O8)

Microcline Feldspar

KAlSi3O8

Graphite

Graphite (Carbon, C)

Pyrite

Iron Sulfide (FeS2)

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)·nH2O (Hydrated iron oxide-hydroxide)

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

Calcite

Calcium Carbonate (CaCO3)

Malachite-bearing Rock

Cu2CO3(OH)2

Copper Ore / Altered Granodiorite

Cupriferous rock with silicate gangue

Graphite

Carbon (C)

Galena

Lead Sulfide (PbS)

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Chrysotile Asbestos

Chrysotile (Mg3Si2O5(OH)4)

Epidote

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

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Quartz crystal cluster

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

Rounded, weathered stone (likely basaltic or andesitic river cobble)

Fine-grained mafic to intermediate volcanic rock; exact identification requires examination of a fresh surface

Botryoidal Hematite

Iron(III) oxide (Fe2O3)

Vanadinite

Lead Chlorovanadate, Pb5(VO4)3Cl

Small brown mineral or rock fragment

Undetermined; the image does not show enough detail for reliable identification

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Microcline Feldspar (Amazonite or White Feldspar)

KAlSi3O8

Amygdaloidal Basalt with Quartz Veining

Basalt (Extrusive Igneous Rock) with Quartz (SiO2) veining

Gneiss

Gneiss (foliated metamorphic rock)

Granite with Mafic Xenolith

Intrusive Igneous Rock (Felsic to Intermediate)

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Granite

Granite (Felsic Plutonic Rock)

Quartz Crystal

Silicon Dioxide (SiO2)

Blue apatite specimen

Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F)

Basalt with an orange mineral vein

Fine-grained basalt, likely containing iron-stained calcite or zeolite; exact identification requires testing

Unidentified polished mineral specimen

Indeterminate; likely a pale feldspar or quartz-bearing material

Greenstone (likely chlorite- or actinolite-rich metabasalt)

Metamorphosed mafic volcanic rock; commonly greenschist-facies basalt, composed chiefly of chlorite, actinolite, epidote, and albite

Rounded dark-gray rock, likely diorite or andesite

Probable diorite (plagioclase and hornblende/pyroxene); identification is limited by the image

Exposed shoreline bedrock and sediment

Unidentified natural rock; the image does not show enough detail for a specific geological identification

Granite pebble

Granite; predominantly quartz, feldspar, and mica

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Red garnet crystal cluster

Most likely almandine garnet, Fe₃Al₂(SiO₄)₃; exact species cannot be confirmed from the image alone.