Weathered banded gneiss
Foliated quartz–feldspar-rich gneiss; exact mineral identification requires closer examination
metamorphic
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Gneiss (Metamorphic Pebble)
Gneissic Metamorphic Rock
metamorphic
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Malachite on Quartz
Cu2CO3(OH)2 / SiO2
mineral
Granite or Granitic Gneiss River Rock
Granite
igneous
Limonite
FeO(OH)·nH2O
mineral
Granite-like rock
Felsic intrusive igneous rock, probably granitic or granodioritic
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Lepidolite Granite
Granite with lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2)
igneous
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Quartz-rich rock, likely milky quartz vein material
Quartz (SiO₂), possibly with iron-oxide staining and minor associated minerals
mineral
Milky Quartz with Country Rock contact
Silicon Dioxide (SiO2) in contact with Metamorphic/Igneous rock
mineral
Granite boulder
Granite, chiefly quartz–feldspar–mica plutonic rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock
sedimentary
Tumbled brecciated jasper (likely ocean or mahogany jasper)
Jasper—microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Coarse-grained dark igneous rock, probably diorite
Diorite (tentative; exact identification requires closer examination)
igneous
Shale
Shale (clastic sedimentary rock)
sedimentary
Small polished agate (likely banded chalcedony)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Shale
Argillite / Shale
sedimentary
Sandstone (Weathered Cobble)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Veined Quartzite / Vein-filled Sedimentary Rock
Siliciclastic rock with iron oxide-filled fractures
sedimentary
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Sandstone
Clastic sedimentary rock
sedimentary
Pebble
Clast (specifically a granule or small pebble)
Sedimentary
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Greenish rough stone, possibly serpentine or soapstone
Indeterminate from the image; possible serpentinite (serpentine-group minerals) or talc-rich soapstone
metamorphic
Greenstone (likely metamorphosed mafic rock)
Probable chlorite–actinolite–epidote-rich metabasalt; exact identification requires testing
metamorphic
River Pebble (Granite/Gneiss)
Granitic Pebble / Quartz-Feldspar Aggregate
igneous
Shale
Shale (Lutite)
sedimentary
Rounded river pebble, likely quartz-rich stone
Unidentified lithic clast; exact mineralogy cannot be determined from the image
sedimentary
Red Sandstone
Arenite (Iron-rich)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
Rock
Vein Quartz in Basalt or Mafic Rock
Silicon Dioxide (Quartz veins in volcanic host rock)
igneous
Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Green serpentine (likely serpentine-rich stone)
Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; composition approximately Mg₃Si₂O₅(OH)₄
metamorphic
Sandstone and Conglomerate pebbles
Sedimentary clastic rock
sedimentary
Small rounded pebble (rock type indeterminate)
Unidentified lithic pebble; specific composition cannot be determined from the image
sedimentary