Vein Quartz in Basalt or Mafic Rock
Silicon Dioxide (Quartz veins in volcanic host rock)
igneous
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Sandstone (with Rock Art)
Sandstone (Clastic Sedimentary Rock)
sedimentary
Small weathered mineral/rock fragment
Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock
mineral
Shale
Argillite / Shale
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Sandstone (Iron-stained)
Arenite with Limonite/Hematite staining
sedimentary
Granite
Intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase
igneous
Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Gneiss (Metamorphic Pebble)
Gneissic Metamorphic Rock
metamorphic
Granite River Rock
Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)
igneous
Greenstone, likely altered basalt
Metabasalt (chlorite–actinolite–epidote assemblage), likely greenschist-facies greenstone
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Shale
Shale (Lutite)
sedimentary
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Quartz in Greenstone
Metamorphic rock with quartz vein (SiO2 / mixed silicates)
metamorphic
Quartz with Host Rock
Silicon Dioxide (SiO2)
mineral
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within metamorphic/igneous matrix
igneous/metamorphic
Granodiorite (Weathered)
Granodiorite
igneous
Granodiorite
Granodiorite (Intermediate intrusive igneous rock)
igneous
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary
River Pebble (Granite/Gneiss)
Granitic Pebble / Quartz-Feldspar Aggregate
igneous
Granite
Felsic intrusive igneous rock
igneous
N/A - Non-Geological Item
not a rock/mineral
Granite
Intrusive Igneous Rock
igneous
Vesicular Basalt / Scoria pebble
Extrusive igneous rock with amygdaloidal infilling
igneous
Basalt
Basalt
Igneous
Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)
FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)
mineral
Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)
Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein
igneous or sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Shale or Slate with Quartz Veins
Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins
Metamorphic, likely Sedimentary with Quartz veins
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Porphyritic Basalt or Porphyritic Andesite
Porphyritic Extrusive Igneous Rock
igneous
Shale with Quartz Veins
Fissile Sedimentary Rock (SiO2)
sedimentary
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Lapis Lazuli
(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)
metamorphic
Quartz Vein in Basalt or Slate
Hydrothermal quartz vein traversing mafic host rock
metamorphic