Mineral On Sedimentary Rock

Green Opal

Hydrated Silica (SiO2·nH2O)

Chalcedony in Host Rock

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Jasper

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Ironstone Concretion

Siderite or Limonite Concretion

Sandstone (Red Sandstone / River Stone)

Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)

Gneiss

Gneiss (High-grade metamorphic rock)

Yellow Quartz (Citrine Quartz variety / Ferruginous Quartz)

Silicon Dioxide (SiO2) with iron inclusions

Ironstone Concretion (Limonite/Goethite)

Goethite-rich Concretion (FeO(OH))

River Pebble (Gravel)

Clastic sedimentary rock (likely Siltstone or Mudstone pebble; SiO2 with various impurities)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz Geode

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (SiO2, often with CaCO3 or Fe2O3 cement)

Granite (Dioritic or Hornblende-rich)

Phaneritic Plutonic Felsic to Intermediate Igneous Rock

Quartz (Milky or Common Quartz)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (primarily composed of SiO2 with Fe2O3 cement)

Quartz Geode (Smoky Quartz)

Silicon Dioxide (SiO2)

Diorite (Dalmatian Stone)

Phaneritic Plutonic Diorite

Agate (specifically Carnelian Agate or Lake Superior style Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Sandstone (with Liesegang rings or Oxidation)

Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)

Quartz Druzy (on Calcedony/Quartz base)

Silicon Dioxide (SiO2)

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Sandstone (specifically Arkose or Ferruginous Sandstone)

Sandstone (SiO2 with iron oxide inclusions)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

White Precious Opal

Hydrated Silica (SiO2·nH2O)

Quartz Geode

Silicon Dioxide (SiO2)

Pink Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Banded Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)

Sandstone

Arenite

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Gneiss (River Cobble)

Gneiss (Foliated Metamorphic Rock)

Sandstone concretion (Ironstone-stained)

Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Red Jasper

Red Jasper (SiO2 with Fe2O3 impurities)

Red Quartz (Carnelian/Red Jasper Agate)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Sandstone

Sandstone (lithified arenite/wacke)