Mineral Within A Sedimentary Rock

Druzy Quartz on Chert/Chalcedony

Silicon Dioxide (SiO2)

Limestone (specifically Grainstone or Micrite)

Calcium Carbonate (CaCO3)

Basalt Porphyry

Porphyritic Basalt

Diamond (in Matrix)

Carbon (C)

Ironstone Concretion (Moqui Marble)

Iron-oxide Concretion (Hydrated ferric oxide, Fe2O3·nH2O)

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Coal

Bituminous or Anthracite coal (carbon-rich sedimentary rock)

Chert (Yellow Jasper/Quartzite Pebble)

Microcrystalline Silicon Dioxide (SiO2)

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Puddingstone

Conglomerate

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Turquoise

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

Gneiss

Gneiss (High-grade Metamorphic Rock)

Chert (Banded)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Chert (varietal: Flint Pitted Pebble)

Cryptocrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Gneiss (Metamorphic Rock)

Gneiss

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Carnelian

Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities

Amethyst

Crystalline Quartz (SiO2) with iron impurities

Conglomerate with Native Copper

Clastic Sedimentary Rock with Native Copper (Cu)

Coarse-grained Quartz with Feldspar inclusions

Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions

Ferruginous Sandstone (Ironstone Nodules)

Ferruginous Quartz-Arenite (with Goethite/Hematite cement)

Septarian Nodule (Dragon Stone) sphere

Septarian concretion (Calcite, Aragonite, and Limestone)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Dolomite

Dolomite (CaMg(CO3)2)

Chert (containing Quartz)

Microcrystalline Silica (SiO2)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Limestone (with Iron-Oxide staining)

Sedimentary Calcium Carbonate (CaCO3)

Chert (specifically Flint or Dark Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Nodular)

Microcrystalline Silica (SiO2)

Druzy Quartz (on Geode Fragment)

Silicon Dioxide (SiO2)

Native Copper within Host Rock

Native Copper (Cu)

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Fossilized Echinoid (Sea Urchin)

Echinoidea (Class), often found as calcitic fossils