Geode (Quartz / Chalcedony Geode)
SiO2 (Silicon Dioxide)
sedimentary
Category
Man Made Rock (Technosol)
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Granite River Rock
Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granodiorite
Phaneritic-textured Intrusive Granodiorite
igneous
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Basalt Pebble (Vesicular / Beach Cobble)
Basalt (mafic extrusive igneous rock)
igneous
Jasper
Silicon dioxide (SiO2)
mineral
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Yellow Quartzite (River Pebble)
Quartzite (SiO2)
metamorphic
Unidentified Rock Fragment
Unknown
Rock
Amber-bearing Coal/Sedimentary Rock
Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Red Jasper (Beach Pebble)
SiO2 (Microcrystalline Quartz with Hematite inclusions)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Shale / Mudstone
Laminated Mudrock (Siliciclastic Sedimentary Rock)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Vesicular Basalt (or Scoria)
Vesicular Basalt
igneous
Basalt
Basalt
igneous
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Basalt
Basalt
igneous
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
sedimentary
Banded Iron Formation (Fragment)
Banded Iron Formation (BIF)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Diorite
Intermediate plutonic igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Calcite (or Travertine / Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Granite
Granite (composed primarily of Quartz SiO2, Potassium Feldspar KAlSi3O8, and Plagioclase)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss
igneous
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Mexican Cantera Opal
Amorphous hydrated silica (SiO2·nH2O) in Rhyolitic host rock
gemstone
Jasper and Quartz Breccia
Silicified Breccia (Quartz / Chalcedony / Hematite)
sedimentary
Basalt with Weathering Rind
Basalt (Mafic volcanic rock)
igneous
Basalt with Quartz/Quartzite Veins
Aphanitic Mafic Volcanic Rock with Siliceous Infillings
igneous
Basalt
Mafic volcanic rock (primarily plagioclase, pyroxene, and olivine)
Igneous
Basalt with Iron Oxidation (Lattice/Veined)
Mafic Volcanic Rock (principally Plagioclase and Pyroxene)
igneous