Phyllite
Phyllite (regional metamorphic rock)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock)
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Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Basalt
Basalt
igneous
Basalt
Mafic Igneous Pebble
igneous
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Unidentified Rock Fragment
Unknown
Rock
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Limestone
CaCO3 (principally Calcite)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pumice and Scoria
Vesicular Volcanic Ejecta (Rhyolite/Andesite/Basalt)
igneous
Quartz with Hematite
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
mineral
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Limestone (Weathered)
Sedimentary Carbonate Rock (CaCO3)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Limestone Riprap
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Black Tourmaline (Tumbled)
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Likely weathered brown rock fragment
Indeterminate; possibly basaltic or iron-stained mafic rock
igneous
Schist
Mica Schist
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Black Tourmaline (Schorl)
Sodium Iron Aluminum Borate Silicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral/gemstone
Serpentine
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Quartz Vein in Host Rock
Quartz (SiO2) in metamorphic host rock (likely schist or phyllite)
metamorphic
Basalt
Extrusive mafic igneous rock
igneous
Serpentine (Serpentinite)
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Quartzite
SiO2 (Metamorphosed Sandstone)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Greywacke (Sandstone)
Lithic wacke
sedimentary
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
River Pebble (Gneiss/Schist mix)
Metamorphic rock aggregate
metamorphic
Basalt
Mafic Igneous Rock
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
United States Quarter Dollar
Cupronickel Clad Alloy (75% Copper, 25% Nickel over a 100% Copper core)
Metal / Man-made mineral-like object
Ferruginous Sandstone (Ironstone)
Ferruginous Sandstone / Limonite-cemented Quartz Sandstone
sedimentary
Amethyst Quartz Druse
Silicon Dioxide (SiO2) with iron impurities
mineral
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Mineral within Sedimentary Rock