Mineral On Sedimentary

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Sandstone (likely Greywacke or Siltstone variety)

Arenite / Siltstone (primarily SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Aventurine Quartz

Silicon Dioxide (SiO2) with Fuchsite inclusions

Jasper

Jasper (Silicon Dioxide, SiO2)

Banded Gneiss

Gneiss (Metamorphic rock composed of feldspar, quartz, and mica)

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

Howlite

Howlite (Calcium Borosilicate Hydroxide: Ca2B5SiO9(OH)5)

Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Chalcedony (Botryoidal/Chalcedony Rose)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3)

Sandstone

Arenite (primarily SiO2)

Ferruginous Sandstone

Arenite with Iron-oxide cement

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Yellow Chalcedony or River Jasper

Silicon Dioxide (SiO2)

Jasper with Quartz vein

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Sandstone (Gneissic or Banded)

Clastic Sedimentary Rock (composed predominantly of SiO2)

Gneiss

High-grade regional metamorphic rock (Foliated)

Quartz Geode

Silicon Dioxide (SiO2) in a concretion

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Conglomerate

Conglomerate (clastic sedimentary rock)

Feldspar

KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Limonite (Iron Ore)

Hydrated ferric oxide (FeO(OH)·nH2O)

Bauxite (Pisolitic Bauxite)

Bauxite (mixture of Hydrous Aluminum Oxides)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert

Silicon dioxide (SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Geode (Unopened)

Siliceous Concretion / Geode

Banded Calcite (often sold as 'Mexican Onyx' or 'Calcite Onyx')

Calcite (Calcium Carbonate, CaCO3)

Red Sandstone

Ferruginous Sandstone (SiO2 dominated with Fe2O3 cement)

Limestone Gravel

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Sandstone (Stream Pebble)

Arenite (primarily SiO2)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz - SiO2)

Gneiss (specifically Granitic Gneiss)

Gneiss (composed primarily of Quartz, Feldspar, and Biotite/Amphibole)

Sandstone (with manganese staining)

Clastic sedimentary rock (primarily SiO2)

Magnetite / Hematite mix (Iron Ore)

Fe3O4 (Magnetite) / Fe2O3 (Hematite)

Concretion

Sedimentary Concretion (e.g., Siderite or Ironstone)

Biotite (Mica)

Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)