Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock)
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Serpentine (Nephrite-like River Cobble)
Serpentinite (Hydrous Magnesium Iron Silicate)
metamorphic
Quartz Pebble (Milky / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Orange Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Raw Diamond (Rough Uncut)
Diamond (C - pure carbon)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Sandstone (Greywacke)
Arenite / Wacke (SiO2 + varied clasts)
sedimentary
Quartz Vein in Host Rock (Breccia/Rhyolite)
Silicon Dioxide (SiO2) with matrix
Mineral in Igneous/Sedimentary host
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Grey Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Garnet Schist
Almandine Garnet in Schist (X3Al2(SiO4)3)
metamorphic
Red Shale
Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)
sedimentary
Pumice
Pumice (Volcanic glass with vesicular texture)
igneous
Granite
Granite
igneous
Weathered agate or chalcedony nodule
Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining
mineral
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
igneous
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Garnet Schist
Garnet-bearing Mica Schist
metamorphic
Pumice
Vesicular volcanic glass
igneous
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (Sand Grain size)
Silicon Dioxide (SiO2)
mineral
Chert (Ventifact)
Chert (Silicon Dioxide, SiO2)
sedimentary
Aragonite / Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Peridotite (with Olivine)
Peridotite (rich in Olivine, (Mg,Fe)2SiO4)
igneous
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt (Road Aggregate / Crushed Stone)
Aphanitic Mafic Igneous Rock
igneous
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)
sedimentary
Chert with Quartz Vein
Microcrystalline Quartz (SiO2) with Macrocrystalline Quartz
sedimentary
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Granite
Phaneritic plutonic igneous rock (SiO2-rich)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic sedimentary rock)
sedimentary
Pegmatite
Granitic Pegmatite
igneous
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary