Probable weathered basalt or andesite
Fine-grained mafic to intermediate volcanic rock; commonly plagioclase ± pyroxene, amphibole, and iron oxides
igneous
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Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Granite with Quartz Vein
Granite
Igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Jasper and Epidote Breccia
Silicified Brecciated Rock with Epidote
metamorphic
River Rock (Basalt)
Aphanitic Basaltic Rock
igneous
Basalt
Basalt
igneous
Unakite
Epidote-Feldspar rock
Metamorphic Rock
Iron-rich brown stone, possibly weathered chert or ironstone
Undetermined; likely iron-oxide-bearing silica-rich rock (chert/ironstone)
sedimentary
Granite Pebble
Granite
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Mixed River Pebbles and Rock Collection
Polymictic lithic conglomerate, sandstone, and quartz pebbles
sedimentary
Milky quartz (likely quartz-rich vein fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite Pebble
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
Granite Pebble
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
Granite Boulder
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 Pebble
Intrusive Igneous Rock
igneous
Sandstone pebble
Sandstone (mainly Quartz, SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2) in a Geode
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary