Mineral (Tectosilicate)

Talc

Mg3Si4O10(OH)2

Biotite

K(Mg,Fe)_3AlSi_3O_10(OH,F)_2

Limonite

FeO(OH)·nH2O

Granite

Granite

Gneiss

Gneiss (High-grade metamorphic rock)

Unidentified dark mineral/rock fragment

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

Carved serpentine pendant

Serpentine-group minerals, commonly antigorite/lizardite (Mg₃Si₂O₅(OH)₄), possibly mixed with chlorite or other inclusions

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Orthoclase Feldspar (Potassium Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Limonite

FeO(OH)·nH2O

Limonite

FeO(OH)•nH2O

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

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

Likely weathered granite or granitic gneiss

Quartz–feldspar–mica rock; possibly gneissic granite

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

Quartz–feldspar pegmatite mineral specimen

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

Likely olivine (peridot)

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

Sandstone (with Limonite staining)

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

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

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Biotite-rich gneiss with a dark mafic band

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

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)

Sandstone with Quartz Vein

Quartz-veined Arenite (SiO2 in detrital quartz matrix)

Ruby (Raw Corundum)

Al2O3 (Aluminum Oxide)

Bornite

Bornite (Cu5FeS4)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Pink Quartz Cluster

Silicon Dioxide (SiO2)

Copper Ore Specimen

Cupriferous Rock / Malachite-bearing ore

Blue Apatite

Fluorapatite (Ca5(PO4)3(F,Cl,OH))

Likely garnet crystal (rough fragment)

Garnet group; possibly almandine, Fe₃Al₂(SiO₄)₃

Polished banded agate (likely laguna-style fortification agate)

Microcrystalline quartz, SiO₂; chalcedony with concentric bands

Layered metamorphic rock, possibly banded gneiss

Gneiss (tentative; exact identification requires closer examination)

Banded metamorphic rock, likely gneiss

Foliated quartz–feldspar rock (gneiss; exact identification requires closer examination)

Apatite

Fluorapatite (Ca5(PO4)3F)

Tumbled pink granite

Granite, composed mainly of quartz, potassium feldspar, plagioclase, and dark mica or amphibole

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

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

Botryoidal Hematite

Iron(III) oxide (Fe2O3)

Vanadinite

Lead Chlorovanadate, Pb5(VO4)3Cl