Granite
Intrusive Igneous Rock
igneous
Category
Man Made (Synthetic Rock)
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Granite
Intrusive igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Clear Quartz (Rock Crystal) Bracelet
Silicon Dioxide (SiO2)
gemstone
Glacial Cobble (likely Granitic or Gneissic)
Granite/Gneiss Glacial Erratic
igneous
Agate Geode with Quartz Druzy
Chalcedony (SiO2) and Quartz (SiO2)
mineral
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Limonite (after Pyrite Pseudomorph)
Limonite (Hydrated Iron Oxide Mixture, FeO(OH)·nH2O)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Tiger's Iron
Pseudomorphic Quartz Aggregate (contains SiO2 with Fe2O3 and FeOOH)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Conglomerate (with Jasper pebble)
Conglomerate / Microcrystalline Quartz (Jasper)
sedimentary
K2 Jasper (Beads)
Granodiorite with Azurite and Malachite
igneous
Pink Granite
Phaneritic Intrusive Igneous Rock (Granite)
igneous
Mixed River Pebbles and Jasper
Siliciclastic sediment and microcrystalline quartz
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Jasper Pebble
SiO2 (Microcrystalline Quartz)
sedimentary
Chalcedony / Agate Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Granite Pebble
Felsic Igneous Rock (Granitic composition)
igneous
River Stone (Sandstone with Oxide Banding)
Arenite with Iron/Manganese Oxide inclusions
sedimentary
Quartz (Milky Quartz vein fragment)
Silicon Dioxide (SiO2)
mineral
Weathered granite (feldspathic, iron-stained granite)
Granite; primarily quartz, potassium feldspar, plagioclase feldspar, and minor mica/amphibole. Exact identification is uncertain from a single photograph.
igneous
Sedimentary River Rock
Siliciclastic Sedimentary Rock (Quartzite or Sandstone pebble)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Note: Item is not a geological specimen
n/a
none
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)
igneous
Granite Pebble
Phaneritic intrusive igneous rock
igneous
Granite Gneiss
Granitic Gneiss
Metamorphic
Weathered mafic rock, likely basalt
Basalt; primarily plagioclase feldspar, clinopyroxene, and commonly olivine or magnetite
igneous
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Granite (Phaneritic Igneous Rock)
igneous
Chalcedony Geode Fragment
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Granite
Intrusive Igneous Rock
igneous
Pumice
Pumice (Volcanic Rock)
igneous
Quartz Pebble with Host Rock / Schist Matrix
Silicon Dioxide (SiO2) with Metamorphic Host Rock
sedimentary