Granite
Intrusive Igneous Rock
igneous
Category
Organic Materia (Not A Rock Or Mineral)
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Granite
Intrusive Igneous Rock
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
K-Feldspar Granite Fragment
Granite (Alkali Feldspar-rich)
igneous
Weathered granite pebble
Granite, mainly quartz, feldspar, and mica; approximate composition SiO₂-rich continental crust
igneous
Quartz Veined Rock (Likely Graywacke or Quartzite)
Silicon Dioxide (SiO2) veins in Metasedimentary matrix
metamorphic
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Chalcedony (Agate / Moss Agate)
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
FeO(OH)·nH2O
mineral
Sandstone
Sandstone (SiO2-rich framework with variable matrix)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Jasper and Quartz Breccia
Silicified breccia (SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Granite
Intrusive Igneous Rock (Mainly Quartz, Feldspar, and Mica)
igneous
Basalt with Olivine Phenocrysts
Aphanitic Mafic Volcanic Rock (Basalt)
igneous
Fossiliferous Limestone
Calcium carbonate matrix with macrofossils (CaCO3)
fossil
Granite
Intrusive Igneous Rock
igneous
Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone (Water-worn pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Small dark mineral/rock fragment
Indeterminate; possibly magnetite-bearing basalt or iron-rich slag
mineral
Sandstone (Lithic Wacke)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Banded Gneiss with Quartz Vein
Gneiss containing SiO2 (Quartz) intrusion
metamorphic
Quartz Geode or Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Limestone Pebble with Crinoid Fossil
Calcium Carbonate (CaCO3) - Fossiliferous Limestone
sedimentary
Granite
Intrusive Igneous Rock
igneous
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone Concretion
Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartz with Epidote / Serpentine (Vein Quartz)
SiO2 (Quartz) with Ca2(Al,Fe)3(SiO4)3(OH) (Epidote)
metamorphic