Mineral Pseudomorph

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)

Gneiss (specifically Banded Gneiss)

Gneiss

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Botryoidal Hematite

Iron(III) oxide (Fe2O3)

Vanadinite

Lead Chlorovanadate, Pb5(VO4)3Cl

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Red garnet crystal cluster

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

Rounded granite pebble

Granite, a quartz–feldspar–mica plutonic rock

Unidentified polished mineral specimen

Indeterminate; likely a pale feldspar or quartz-bearing material

Fluorite (Rainbow, Purple-Blue Tumbled)

Calcium Fluoride (CaF2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Limonite (Ironstone)

Limonite (FeO(OH)·nH2O)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Polished pink feldspar-rich rock, possibly unakite

Likely unakite (epidote, pink potassium feldspar, and quartz); identification is uncertain from the photo

Schist

Mica Schist

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Green glass-like mineral specimen, likely fluorite

Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass

Tumbled Mixed Gemstones and Rocks

Various mineral species including quartz (SiO2) and silicate minerals

Weathered copper-bearing rock, possibly chrysocolla-bearing quartz or host rock

Indeterminate from the photo; possible chrysocolla (hydrated copper silicate) with quartz or other host minerals

Granite

Intrusive igneous felsic rock

Sandstone with Manganese Dendrites

Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)

Milky quartz cluster

Quartz, silicon dioxide (SiO₂)

Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Yellow iron-oxide-rich mineral/rock fragment

Likely limonite/goethite (hydrated iron oxides; commonly approximated as FeO(OH)·nH₂O)

Shale

Shale (clastic sedimentary rock)

Granite

Granite (Plutonic Igneous Rock)

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Gneiss

Gneiss (Metamorphic rock)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Mixed rock and mineral collection

Unidentified assortment of geological specimens; individual species cannot be determined from the image

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Limonite Stained Basalt

Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)