Mineral (Tectosilicate)

Granite

Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Picture Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Fancy Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Picture Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Sandstone (likely Siltstone variety)

Arenite / Siltstone (primary mineral SiO2)

Amazonite

Microcline (variety Amazonite), K(AlSi3O8)

Olivine (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4

Satin Spar Selenite

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Pyrite

Iron Sulfide (FeS2)

Mica (specimen appears to be Muscovite or Phlogopite)

Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)

Schist

Mica Schist

Sandstone

Arenite (composed primarily of SiO2)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Sandstone (Red)

Arenite (primarily Quartz, SiO2, with Iron Oxide cement)

Ironstone Concretion (Limonite/Hematite Nodules)

Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)

Ferruginous Sandstone (Red Sandstone)

Arenite with Hematite/Limonite cement

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Goethite inclusions

Banded Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)

Red Sandstone

Arenite (Ferruginous Sandstone)

Limonite

Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Limonite and Goethite (Ironstone)

Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper with Manganese Dendrites

Silicon Dioxide (SiO2) with Oxide Mineral Inclusions

Yellow Ocher (Limonite)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Brecciated Chert

Sedimentary Chert (SiO2) with Calc-Silicate mineralization

Jasper (var. Ocean or Polychrome Jasper)

Silicon Dioxide (SiO2) with iron and mineral inclusions

Rutilated Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions

Geode (unopened)

SiO2 - Chert-shelled concretion (mostly Quartz)

Quartzite Pebble

Quartzite (primarily SiO2)

Schist

Mica Schist

Corundum (Ruby Variety)

Corundum (Al2O3)

Granite

Phaneritic Igneous Rock (Granite)

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Blue Apatite

Apatite (Ca5(PO4)3(F,Cl,OH))

Chert (Red Jasper variant)

Microcrystalline Quartz (SiO2)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)