Minerals

Pegmatite

Igneous Pegmatite

Greenstone

Protolith of basalt/gabbro (chlorite-epidote metamorphic facies)

Gneiss

High-grade regional metamorphic rock (Foliated)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Pegmatite with Tourmaline

Igneous Pegmatite (Quartz-Feldspar matrix with Schorl Tourmaline)

Ironstone Concretion (Limonite/Goethite)

Ironstone (primarily FeO(OH)·nH2O)

Ironstone Concretion (Moqui Marble type)

Ferruginous Concretion (Fe2O3 / FeO(OH))

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Phyllosilicate)

Red Sandstone (Iron-stained)

Clastic sedimentary rock (primarily Quartz with Iron Oxides)

Chlorite-rich schist (probable greenschist)

Greenschist-facies metabasalt or chlorite–actinolite schist

Granite

Phaneritic Plutonic Felsic Rock

Granodiorite

Granodiorite

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')

Silicon Dioxide (SiO2) with artificial pigment

Likely mica schist

Mica-rich schist, probably biotite–quartz–feldspar schist

Basalt with Epidote (Greenstone)

Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Granite (probable)

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

Pegmatite

Coarse-grained intrusive igneous rock

White Quartz with Mineral Vein

Silicon dioxide (SiO2)

Likely biotite-rich schist

Mica schist, composed chiefly of quartz and biotite mica

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Banded gneiss pebble

Quartz–feldspar gneiss, possibly with biotite or amphibole

Sulfur

Native Sulfur (S)

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Limonite

FeO(OH)•nH2O

Quartz-rich pegmatite (likely quartz with feldspar)

Pegmatitic granite; chiefly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining

Chalcopyrite

Copper iron sulfide (CuFeS2)

Quartz pebble

Silicon dioxide (SiO2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Howlite

Ca2B5SiO9(OH)5

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Quartz-rich rock, possibly milky quartz

Quartz (SiO₂); the photo may show a quartz-rich rock, but its texture is not clear enough to determine a specific rock name.

Limonite

FeO(OH)·nH2O

Quartz-rich gneiss

Foliated quartz–feldspar–mica gneiss, possibly migmatitic

Weathered granite

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

Mica-rich pegmatite (likely muscovite mica)

Muscovite-bearing granitic pegmatite; muscovite, KAl₂(AlSi₃O₁₀)(OH)₂

Aquamarine in pegmatite

Beryl, Be₃Al₂Si₆O₁₈ (blue-green variety: aquamarine)