Igneous (Anthropogenic)

Epidote

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Basalt with Granite Inclusions (Xenolith)

Mafic Igneous Rock (Basalt) with Felsic Igneous Inclusion (Granite)

Dark mafic igneous rock, likely basalt or gabbro

Basaltic rock composed chiefly of plagioclase feldspar and pyroxene, with possible olivine and iron-oxide minerals

Fine-grained dark igneous rock, likely basalt

Basalt (approximate identification; commonly plagioclase, pyroxene, and minor olivine)

Fine-grained dark igneous rock, likely basalt

Basalt; predominantly plagioclase feldspar and pyroxene, commonly with minor olivine and iron-titanium oxides

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine

Likely basalt or other dark igneous rock

Basalt; predominantly plagioclase feldspar and pyroxene, possibly olivine

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; mainly plagioclase feldspar and pyroxene, possibly olivine or magnetite

Dark mafic igneous rock, likely basalt or gabbro

Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine and iron oxides

Coarse-grained gray igneous rock, likely granite or granodiorite

Granite–granodiorite; mainly quartz, feldspar, and mica (exact identification requires testing)

Dark coarse-grained igneous rock, likely gabbro or diabase

Gabbro–diabase; chiefly plagioclase feldspar and pyroxene, with possible olivine and opaque iron-titanium oxides

Dark gray igneous rock, likely basalt

Basalt; fine-grained plagioclase–pyroxene rock, commonly with minor olivine and magnetite

Tumbled dark igneous rock, likely basalt

Basalt; commonly composed of plagioclase feldspar, pyroxene, and olivine

Coarse-grained gray igneous rock, likely granite or granodiorite

Granite–granodiorite; chiefly quartz, feldspar, and dark mica/amphibole

Olivine (Peridot)

Magnesium Iron Silicate ((Mg, Fe)2SiO4)

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Sodalite

Na8(Al6Si6O24)Cl2

Quartz with Sulfide Inclusions

Silicon Dioxide (SiO2) with metallic mineral inclusions

Pyrite

Iron Sulfide (FeS2)

Magnetite (Loadstone candidate)

Iron(II,III) oxide (Fe3O4)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Pegmatite

Pegmatitic Granite containing Quartz, Feldspar, and Schorl

Granite Cobble

Granitoid

Banded Sandstone (Water-worn Pebble)

Arenite with mineral banding

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Quartz (Translucent/Rose variety)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Druzy Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartz (Pegmatitic Quartz with Feldspar)

SiO2 (Silicon Dioxide)