Mineral Side Rock

Geode with Quartz and possibly Jasper/Hematite

Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Sandstone (Banded Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with iron oxide impurities)

Iron-stained quartz-rich rock (possibly ironstone)

Quartz (SiO₂) with iron-oxide/hydroxide staining, likely limonite/goethite

Banded Sandstone

Arenite (with iron oxide banding)

Quartz (Milky/Crystalline)

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz Arenite)

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Smooth river pebble (exact rock type indeterminate)

Unidentified rounded lithic clast; composition cannot be determined from the photograph

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Small pale-green stone, possibly serpentine or quartz

Undetermined from the image; no diagnostic features confirm a specific mineral

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Sandstone (with Limonite staining)

Arenite (primarily SiO2 with FeO(OH)·nH2O)

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Porphyritic Basalt or Porphyritic Andesite

Porphyritic Extrusive Igneous Rock

River Cobble (Weathered Granitoid)

Granodiorite / Quartz Diorite

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2)

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Sandstone

Arenite (SiO2 principal)

Small rounded mineral/rock fragment

Indeterminate; possibly quartz-rich stone or feldspar

Sandstone

Clastic Sedimentary Rock

Shale

Shale (clastic sedimentary rock)

Banded Gneiss

Gneiss (Foliated Metamorphic Rock)

Greenstone pebble (identification uncertain from photo)

Greenstone, typically metamorphosed mafic rock composed of chlorite, actinolite, and epidote

Shale

Argillaceous Sedimentary Rock

Glacial Cobble with Granite Inclusion

Porphyritic Basalt or Andesite containing Granitic Xenolith

Agated Chert

Microcrystalline Quartz (SiO2)

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Moqui Marble

Hematite-Goethite Concretion

Granite fragment

Granite (Felsic intrusive igneous rock)

Red Sandstone

Sedimentary Quartz Arenite / Arkose

Chert with Quartz Veining

Microcrystalline Silica (SiO2)

Sandstone

Clastic Sedimentary Rock

Likely polished or naturally smoothed pebble with a pale mineral patch

Undetermined; possibly a dark volcanic rock with a quartz or feldspar inclusion

Greenstone (likely greenschist)

Chlorite–actinolite–epidote-rich metabasalt; mineral proportions cannot be confirmed from the photo

Conglomerate

Clastic Sedimentary Rock

Iron-rich sandstone concretion

Ferruginous sandstone, cemented chiefly by iron oxides (such as goethite and hematite)

Sandstone

Arenite (SiO2 based with various mineral cements)