Organic Materia (Not A Rock Or Mineral)

Quartzite with Iron Mineral Banding

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) staining

Quartz Pebble

Silicon Dioxide (SiO2)

Vesicular Basalt with Lichen

Vesicular Basalt

Conglomerate

Conglomerate (clastic sedimentary rock)

Gossan (Iron Hat)

Limonitic Gossan (predominantly FeO(OH)·nH2O)

Sandstone

Arenite (SiO2 based)

Sandstone

Arenite (Clastic Sedimentary Rock)

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) within a nodule

Sandstone (Calcareous or Ferruginous)

Clastic sedimentary rock (SiO2 with CaCO3 or Fe2O3 cement)

Rough Tanzanite

Zoisite (Ca2Al3(SiO4)3(OH))

Pegmatite (Granite Pegmatite)

Intrusive Igneous Rock (Granite Pegmatite)

Sandstone with Foliose Lichen

Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)

Banded Agate

Chalcedony / Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Granite (Weathered)

Phaneritic Felsic Igneous Rock

Granite

Phaneritic Igneous Rock (Granite)

Iron-stained Quartz (Gossan/Limonite-coated Quartz)

Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Sandstone (Stream-rounded)

Arenite (SiO2 based)

Malachite and Azurite on Matrix

Cu2CO3(OH)2 (Malachite) / Cu3(CO3)2(OH)2 (Azurite)

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Dalmatian Stone (commonly Dyed)

Dalmatian Jasper (Peralkaline igneous rock)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chert (specifically a nodule with Chalcendony/Agate banding)

Microcrystalline Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Sandstone

Clastic sedimentary rock (primarily SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Blue Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Milky Quartz

Silicon Dioxide (SiO2)

Moonstone

Orthoclase (KAlSi3O8) with inclusions of Albite (NaAlSi3O8)

Schist

Mica Schist

Thunderegg (Agetized Geode nodule)

Rhyolitic Agate Nodule (SiO2 filling volcanic cavities)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Basalt with Vesicular Surface

Basalt (Mafic Extrusive)

Epidote (or Epidote-rich rock)

Epidote. Mineral formula: Ca2(Al,Fe)3(SiO4)3(OH).