Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Category
Mineral Side Rock
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Geode
Quartz / Chalcedony nodule
sedimentary
Note: Item is not a geological specimen
n/a
none
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Xenolith in Basalt
Mafic Igneous Rock with Felsic Inclusion
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Geode Nodule Fragment
Quartz / Chalcedony Nodule
sedimentary
Dark igneous rock, likely basalt or diabase, with a second purplish specimen
Basalt/diabase; exact identification is uncertain from the photograph
igneous
Red Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Coarse-grained granite or granitic pegmatite fragment
Granite; primarily quartz, feldspar, and mica
igneous
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with iron oxide Fe2O3 staining)
sedimentary
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Wishing Stone (Quartz Vein in Greywacke / Basalt)
Quartz vein in host rock (e.g. Meta-basalt or Greywacke)
metamorphic
Sandstone (with Iron Staining)
Arenite (primarily SiO2 with Fe2O3/FeO(OH) oxides)
sedimentary
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Gravel and Sediment Sample
Mixed clastic sediment
sedimentary
Sandstone
Sandstone (composed predominantly of Quartz, SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pink granite
Granite, chiefly quartz, potassium feldspar, and plagioclase with minor mica
igneous
Red Sandstone
Arenite (Iron-rich)
sedimentary
Angular gray rock fragments
Unidentified fine-grained rock; the image does not show diagnostic features sufficient for a specific identification
igneous
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Gravel
Unconsolidated rock fragments / detrital sediment
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Vesicular Basalt (Lava Rock)
Vesicular Basalt
igneous
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Likely gneiss (banded metamorphic rock)
Felsic-to-intermediate gneiss; exact mineral identification requires closer examination
metamorphic
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral
Gneiss (Metamorphic Pebble)
Gneissic Metamorphic Rock
metamorphic
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral