Mineral Precipitate (Anthropogenic Context)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Blue Kyanite

Kyanite (Al2SiO5)

Marble

Recrystallized Calcite (CaCO3)

Blue Sapphire

Corundum (Al2O3 with trace Titanium and Iron)

Orange Calcite (Carved as a Horned Skull)

Calcium Carbonate (CaCO3)

Sandstone (Green/Yellow Siltstone variant)

Arenite or Siltstone (primarily SiO2 with mineral staining)

Turquoise

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

Red Sandstone

Arenite (primarily SiO2 with hematite/iron oxide coating)

Basalt with Epidote/Chlorite

Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))

Gneiss

Gneiss (High-grade metamorphic rock)

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Sandstone

Arenite (primarily SiO2)

Ferruginous Sandstone

Ferruginous Clastic Sedimentary Rock

Fossil Shark Tooth (Sand Tiger or Mackerel Shark)

Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate

Garnetiferous Quartzite (Garnet Gneiss Pebble)

Garnet-bearing Quartzite or Quartz-Feldspar Gneiss

Mica (likely Muscovite)

Muscovite / KAl2(AlSi3O10)(OH)2

Biotite (Black Mica)

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

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3/FeO(OH) cementing agents)

Sandstone

Arenite (primarily SiO2)

Jasper

Silicon Dioxide (SiO2) with impurities (mostly Iron Oxides)

Basalt with Amygdules

Amygdaloidal Basalt

Mahogany Obsidian

Obsidian (Volcanic Glass) with Hematite or Magnetite inclusions, SiO2 (Silicon Dioxide)

Quartz (White/Milky Pebble)

Silicon Dioxide (SiO2)

Basalt with Quartz Vein

Mafic Igneous Rock (SiO2 filling)

Gneiss (with Quartzite and Biotite)

Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3

Mica Schist

Foliated Metamorphic Rock (rich in Muscovite or Biotite)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Olivine (Peridot)

Olivine Group (Mg,Fe)2SiO4

Quartz with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Pyrite

Iron Sulfide (FeS2)

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Epidote in Quartz

Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)

Amazonite

Potassium Feldspar (KAlSi3O8)

Garnet (specifically Almandine)

Almandine - Fe3Al2(SiO4)3

Pyrite in Quartz

FeS2 (Iron Pyrite) with SiO2 (Quartz)

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Schist

Mica Schist