Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Category
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Conglomerate
Conglomerate
sedimentary
Quartz / Quartzite
Silicon Dioxide (SiO2)
mineral
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Limonite Stained Basalt
Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)
igneous
Quartz Grain
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Chrysocolla and Azurite in Matrix
Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)
mineral
Sandstone
Arenite (with iron oxide cement)
sedimentary
River Agate (Chert/Chalcedony)
Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Vesicular Basalt (or Scoria)
Basalt (Aphanitic-Vesicular Mafic Igneous Rock)
igneous
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Ferruginous Sandstone
Arenite with Hematite/Limonite cement (SiO2 + Fe2O3)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Basalt River Stones
Aphantic Mafic Igneous Rock (Basalt)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Fire Opal in Host Rock
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Unakite
Epidotized Granite
metamorphic
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Sandstone
Arenite
sedimentary
Jasper Pendant
Chalcedony (Quartz) - SiO2
Mineral/Sedimentary
Ocean Jasper
Orbicular Jasper / Silicate
Mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Basalt pebble
Aphanitic Mafic Volcanic Rock (Fe/Mg rich)
igneous
Granite
Phaneritic Intrusive Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Travertine (or Calcareous Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Basalt
Basalt (silicate rock primarily plagioclase and pyroxene)
igneous
Granite
Granite (Mainly Quartz: SiO2, Feldspar: KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8, and Mica)
igneous
Basalt
Basalt
igneous
Glauconitic Sandstone
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony - SiO2)
sedimentary
Feldspar Granodiorite
Granodiorite (Na,Ca)(Si,Al)4O8
igneous
Serpentine
Serpentinite (group of minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Basalt
Basalt (primarily Plagioclase feldspar and Pyroxene)
igneous