Mineral

Likely mica schist

Mica-rich schist, likely muscovite–biotite schist; exact identification requires examination

Weathered granite pebble

Granite, composed mainly of quartz, feldspar, and mica

Pink granite

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

Weathered granite or granitic gneiss

Quartz–feldspar–mica granitic rock; possible biotite gneiss

Quartz-rich Diorite

Diorite (Phaneritic intermediate igneous rock)

Gneiss

Gneiss

Granodiorite

Granodiorite

Granite fragment

Granite (Felsic intrusive igneous rock)

Gneiss (High-grade Metamorphic Rock)

Gneiss

Granite Cobble

Granite

Granite

Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)

Green glassy slag or manufactured glass bead

Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Gneiss

Gneiss (High-grade metamorphic rock)

Native Copper in Basalt

Cuprum (with Host Basalt)

Gneiss

High-grade Metamorphic Gneiss

Gneiss

Gneiss

Limonite

FeO(OH)·nH2O

Chrysocolla

Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Magnetite

Magnetite (Fe3O4)

Schist

Schist

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Epidote

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

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Granite fragment

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

Likely granite

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

Likely granite pebble

Granite, a quartz–feldspar–mica intrusive igneous rock

Rounded granitic pebble

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

Granite

Intrusive Igneous Rock

Amygdaloidal Basalt with Agate/Zeolite Amygdules

Basalt (extrusive igneous rock) containing secondary mineral fillings

Small brown mineral or rock fragment

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

Rounded granitic pebble

Likely granite or granodiorite; exact identification is uncertain from the photograph.

Granite

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

Blue-gray calcite (likely cleavage specimen)

Calcite, CaCO₃

Weathered granite or granitic rock

Granite; chiefly quartz, feldspar, and mica

Pink Granite

Granite (Phaneritic Quartz-Feldspar rock)

Granite Pebble

Granite

Red Granite Pebble

Intrusive Felsic Igneous Rock (Granite)

Granite Pebble

Intrusive Igneous Rock (Granite)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss (Metamorphic Rock)