Mineral

Orthoclase Feldspar (Potassium Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz Mineral

Silicon Dioxide (SiO2)

Blue-green mineral specimen, possibly turquoise

Uncertain from the image; turquoise is hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Limonite

FeO(OH)•nH2O

Iron-rich rock fragment (possibly ironstone or limonite/goethite)

Likely ironstone composed largely of goethite/limonite; image alone cannot confirm

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Magnetite

Fe3O4 (Iron(II,III) oxide)

Unidentified dark mineral/rock fragment

Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral

Likely serpentine-rich rock (serpentinite)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, or chrysotile); exact identification is uncertain from the image alone

Biotite-rich gneiss with a dark mafic band

Banded gneiss, likely quartz–feldspar–biotite gneiss (exact minerals uncertain from the image)

Tumbled quartz-rich pebble (likely quartzite or vein quartz)

Quartz (SiO₂), possibly quartzite with minor iron-oxide staining

Quartz–feldspar pegmatite mineral specimen

Quartz (SiO₂) with potassium feldspar, albite, mica, and likely garnet or tourmaline

Red granite boulder

Granite, a coarse-grained felsic intrusive igneous rock; commonly quartz + feldspar + mica

Granite

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

Iron-oxide-stained rock with a pale mineral vein

Likely limonite/goethite-stained quartz-bearing rock; exact identification is uncertain from the image

Sandstone

SiO2 (predominantly quartz sand)

Likely weathered granite or granitic gneiss

Quartz–feldspar–mica rock; possibly gneissic granite

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Likely olivine (peridot)

Olivine-group silicate, approximately (Mg,Fe)₂SiO₄

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)·nH2O

Epidote

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

Quartz Cluster on Matrix

Silicon Dioxide (SiO2)

Epidote

Calcium aluminum iron silicate hydroxide, Ca2(Al, Fe)3(SiO4)3(OH)

Fluorite

Calcium Fluoride (CaF2)

Limonite

FeO(OH)·nH2O

Peacock Ore

Bornite (Cu5FeS4)

K-Feldspar (Microcline / Orthoclase)

Potassium Feldspar (KAlSi3O8)

Pyrite

Iron Sulfide (FeS2)

Quartz Crystal

Silicon Dioxide (SiO2)

Lepidolite

K(Li,Al)3(Si,Al)4O10(F,OH)2

Aragonite

Aragonite (CaCO3)

Wollastonite

Wollastonite (CaSiO3)

Magnetite

Iron(II,III) oxide, Fe3O4

K-feldspar

Potassium Feldspar (Orthoclase / Microcline, KAlSi3O8)

Chalcedony

Silicon Dioxide (SiO2)

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Kyanite

Aluminium Silicate, Al2SiO5

Epidote

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

Biotite

K(Mg,Fe)3AlSi3O10(OH)2

Mica

Phlogopite / Biotite / Muscovite