Igneous Or Sedimentary (Anthropogenic Modification)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone

Arenite (Siliclastic Sedimentary Rock)

Obsidian

Volcanic Glass (SiO2)

Obsidian

Obsidian (Volcanic Glass)

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Basalt

Mafic Igneous Rock (composed of plagioclase feldspar and pyroxene)

Olivine-bearing Basalt / Scoria

Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Granite (Micro-specimen)

Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Granitic Pegmatite

Granite Pegmatite (coarse-grained intrusive igneous rock)

Basalt (River Pebble)

Extrusive Magic Igneous Rock (Mainly Plagioclase and Pyroxene)

Pink Granite

Felsic intrusive igneous rock (composition: SiO2 and Al2O3)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Obsidian

Volcanic Glass (Extrusive Igneous Rock, primarily SiO2)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Basalt with Peridotite Inclusion

Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith

Granite

Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Basalt

Basalt (Aphanitic-fine grained mafic igneous rock)

Granitoid (Granite/Granodiorite)

Plutonic igneous rock (variable composition, primarily SiO2)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Sandstone

Sandstone (lithified arenite/wacke)

Jasper

Silicon dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

Sandstone (Weathered Cobble)

Clastic Sedimentary Rock (primarily SiO2)

Pink Tourmaline (Rubellite)

Rb:Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite variety)

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

Unakite

Epidotized Granite

Chlorite (Small Flakes/Sand)

Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

River Quartz (Milky and Smoky mix)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Fluorite (Green)

Fluorite (Calcium Fluoride, CaF2)