Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
Category
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Unakite
Epidotized Granite
metamorphic
Fossil Coral
Tabulate Coral (potentially Favosites or Calapoecia)
fossil
Unakite
Unakite (Epidotized Granite)
metamorphic
Brachiopod Fossil in Sedimentary Matrix
Phylum Brachiopoda in Siltstone/Mudstone matrix
fossil
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Diamond (in Matrix)
Carbon (C)
mineral
Quartz Vein in Metamorphic Rock
Silicon Dioxide (SiO2) within Metasedimentary host
metamorphic
Jasper
Silicon Dioxide (SiO2)
mineral
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Goethite
Goethite (FeO(OH))
mineral
Conglomerate with Quartz Inclusions
Conglomerate (clastic sedimentary rock) with internal Quartz (SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
metamorphic
Shale
Lutaceous Sedimentary Rock
sedimentary
Basalt
Extrusive Igneous Basalt (contains Plagioclase Feldspar and Pyroxene)
igneous
Serpentinite
Serpentine group minerals ((Mg, Fe)3Si2O5(OH)4)
metamorphic
Pink Granite
Phaneritic Plutonic Rock (Felsic)
igneous
Scoria (Lava Rock)
Vesicular Basalt / Scoria
igneous
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Unakite (Epidote with Quartz and Feldspar)
Unakite (Metasomatized Granitic Rock)
metamorphic
Vesicular Basalt (Scoria)
Vesicular Basalt
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Basalt River Stone
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Basalt Pebble
Basalt
igneous
Granite Cobble
Granite (Phaneritic Igneous Rock)
igneous
Agate
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Grey Agate (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Crushed Rock (Basalt)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Gneiss
Gneiss (a metamorphic rock)
Metamorphic
Granite
Granite (Alkali-feldspar, Quartz, and Plagioclase composition)
igneous
Quartz Geode (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Pelitic or Shaly Matrix
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (extrusive igneous rock)
igneous
Pumice
Pumice (Felsic volcanic rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Green Apophyllite and Stilbite on Quartz Cluster
Apophyllite-(K) (KCa4(Si8O20)(F,OH)·8H2O), Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O), Quartz (SiO2)
Mineral