Granite River Rock
Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Category
Igneous Or Mineral
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Granite
Felsic intrusive igneous rock
igneous
Likely magnetite-rich rock fragment
Magnetite (Fe₃O₄), possibly in a fine-grained host rock
mineral
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Basalt with Amygdules
Extrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive igneous rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Mixed Rock and Mineral Collection
Multiple geological specimens
mineral
Granite Pebble
Intrusive Igneous Rock
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Small rough mineral fragment, possibly quartz or feldspar
Unidentified silicate mineral; image is insufficient for a reliable species identification
mineral
Green Quartz
Silicon Dioxide (SiO2)
mineral
Granite Boulder
Phaneritic Felsic Igneous Rock
igneous
Limonite Concretion
Hydrated Iron Oxide-Hydroxide (FeO(OH)·n H₂O)
mineral
Epidote
Ca2(Al,Fe)3(SiO4)3(OH)
mineral
Granite Gravel and Pebbles
Phaneritic Igneous Rock Aggregate
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
K-feldspar (Potassium Feldspar)
Potassium Feldspar (KAlSi3O8)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Granite (compositionally: Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite
Intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Epidote
Ca2(Al,Fe)3(SiO4)3(OH)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
K-Feldspar (Potassium Feldspar / Pink Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Rainbow Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Tumbled blue stone, possibly sodalite or blue quartz
Indeterminate from the photograph; possibilities include sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue quartz (SiO₂)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral