White Chalcedony (likely Common Opal or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
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Quartz with Iron Oxide Monzonite or Sandstone contact
Quartz (SiO2) with Limonite/Hematite staining
mineral
Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins
Altered mafic rock or Epidosite
metamorphic or igneous alteration
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide Fe2O3 cement)
sedimentary
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Garnet in Host Rock
Garnet Group (A3B2(SiO4)3)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 impurities)
sedimentary
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Sandstone (with Quartz veining)
Arenite (primarily SiO2)
sedimentary
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Red Sandstone
Quartz Arenite (with Iron Oxide)
sedimentary
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Granite
Granite (Mainly Quartz SiO2 and Feldspar KAlSi3O8)
igneous
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Schist
Mica Schist
metamorphic
Vesicular Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 (Pyroxene) and (Ca,Na)Al(Al,Si)Si2O8 (Plagioclase Feldspar)
igneous
Leopard Skin Jasper
Jasper (Silicon Dioxide with impurities), SiO2
sedimentary
Granite (Pegmatitic)
Phaneritic Felsic Igneous Rock
igneous
Basalt
Mafic Extrusive Igneous Rock
Igneous
Lake Superior Agate
Chalcedony (SiO2 with iron impurities)
mineral
Sandstone
Arenite
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Quartz Pebble (with iron staining)
Quartz (Silicon Dioxide, SiO2)
mineral
Amethyst Geode Fragment
Amethyst (Silicon Dioxide, SiO2) with Quartz matrix
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Sandstone (lithic)
Lithic Wacke / Arenite
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Serpentine (Nephrite-like River Cobble)
Serpentinite (Hydrous Magnesium Iron Silicate)
metamorphic
Sandstone
Clastic Sedimentary Rock (composed primarily of Quartz, SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a secondary sedimentary structure
sedimentary
Pink Granite
Granite (Phaneritic Quartz-Feldspar Rock)
igneous