Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Red Jasper

Jasper (Silicon Dioxide based crypto-crystalline Quartz with Iron inclusions)

Septarian Nodule (Dragon Stone)

Septarian concretion (composition: CaCO3 - Calcite, Aragonite, and Siderite/Limestone)

Diamond Drill Core (Greenschist and Quartzite)

Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Grain/Pebble)

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Gneiss

Metamorphic rock of high-grade regional metamorphism

Red Sandstone (Old Red Sandstone)

Ferruginous Sandstone (SiO2 + Fe2O3)

Boulder Opal

Precious Opal in Ironstone (Amorphous Hydrated Silica, SiO2·nH2O)

Gold-Bearing River Sand

Auriferous Placer Sand (Au + various minerals like SiO2 and Fe3O4)

Turquoise (set in silver jewelry)

Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

Conglomerate

Conglomerate

Biotite Schist

Biotite Schist

Zebra Jasper

Tetragonal Silicon Dioxide (Quartz) with impurities

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Orange Calcite

Calcium Carbonate (CaCO3)

Limonite-stained Quartz / Quartzite

Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)

Pyrite

Iron Sulfide (FeS2)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)

Banded Gneiss

Gneiss (quartz-feldspar-biotite metamorphic rock)

Agate

Agate (a cryptocrystalline variety of Quartz, SiO₂)

Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)

SiO₂ (silicon dioxide)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone with Bedding Planes

Arenite (Sedimentary rock composed primarily of sand-sized minerals)

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Quartz (Milky/Clear)

Silicon Dioxide (SiO2)

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Chert (often referred to as 'Jasper' when red)

Chert (microcrystalline quartz, SiO₂)

Yellow Jasper

Silicon Dioxide (SiO2) - variety Jasper

Shiva Lingam

Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)