Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Pumice

Pumice (a highly vesicular volcanic glass)

Granite

Phaneritic Felsic Igneous Rock

Granitoid Pebble (Graphic Granite/Pegmatite)

Pegmatitic Granite with Quartz and Orthoclase

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Yellow Quartz (Citrine-colored Quartz Pebble)

Silicon Dioxide (SiO2)

Basalt with Scoria

Mafic Volcanic Rock (Basalt/Scoria)

Granite

Phaneritic Felsic Igneous Rock

Granite (phaneritic background) with Limestone/Calcite carving

Felsic Igneous Plutonic Rock (background) / Calcium Carbonate (CaCO3) (carving)

Fuchsite (Green Muscovite)

K(Al,Cr)2(AlSi3O10)(OH)2

Obsidian

Obsidian (volcanic glass)

Quartzite

Quartzite (SiO2)

Milk Quartz (River Pebble)

Quartz (Silicon Dioxide, SiO2)

Quartzite

Quartzite (SiO2)

Amethyst

Silicon dioxide with iron impurities (SiO2)

Basalt

Basalt (Igneous Volcanic Rock)

Rutilated Quartz

Quartz (SiO2) with Rutile (TiO2) inclusions

Quartz (Double-Terminated)

Silicon Dioxide (SiO2)

Pink Granite

Granite (Phaneritic intrusive rock rich in K-feldspar)

Basalt

Basalt (Mafic volcanic rock)

Native Copper in Basalt

Cuprum (with Host Basalt)

Basalt Pebble

Aphanitic Mafic Igneous Rock

Shale (with Iron Oxide staining)

Fissile Mudstone (primarily Quartz and Clay minerals)

Aquamarine on Feldspar Matrix

Beryl (Be3Al2Si6O18) with Potassium Feldspar (KAlSi3O8)

Basalt

Basalt (Mafic volcanic rock)

Basalt

Basalt (Mafic volcanic rock)

Botryoidal Malachite

Malachite - Cu2CO3(OH)2

Chert / Chalcedony (likely carnelian or flint variety)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (typically quartz, feldspar, mica, amphibole composition)

Sunstone with Black Tourmaline (Arfvedsonite)

Feldspar (Na,Ca)(Al,Si)4O8 with Schorl Na(Fe3+)3Al6(Si6O18)(BO3)3(OH)3(OH)

Smoky Quartz

Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)

Basalt

Basalt (composition of plagioclase feldspar, pyroxene, and olivine)

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Mahogany Obsidian

Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)

Amazonite

Amazonite (KAlSi3O8 - Microcline)

Basalt (Lava Rock) and Dyed Glass/Quartz

Scoria (Vesicular Basalt)

Cupronickel (on a 1981 Mexico 20 Pesos coin)

Copper-Nickel Alloy (Cu75Ni25)

Chert (Jasper/Flint variation)

Chert (SiO2)

Blue Dyed Agate

Silicon Dioxide (SiO2)

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Sandstone (with cross-bedding)

Arenite (composed primarily of Quartz: SiO2)

Milky Quartz (Water-worn Pebble)

Quartz (Silicon Dioxide, SiO2)