Mineral Precipitate (Anthropogenic Context)

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Bumblebee Jasper

Fossiliferous Calcite containing Orpiment and Realgar

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Biotite Schist

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

Glauconite (Glauconitic Sandstone)

Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]

K2 Azurite Granite / K2 Stone

Granite (igneous rock) with Azurite inclusions (mineral)

Porphyritic Basalt (with Amygdales)

Amygdaloidal Porphyritic Basalt

Mixed Gemstone Collection

SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)

Aquamarine

Beryl (Be3Al2Si6O18)

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Sandstone (Ferruginous)

Arenite (with Iron Oxides)

Turquoise

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

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Red Sandstone (Hematitic)

Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)

Sandstone (Ferruginous)

Arenite (with Goethite/Limonite cement)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Sandstone (Red)

Arenite (composed primarily of SiO2)

Ferruginous Sandstone

Sandstone with Iron Oxide (Limonite/Goethite)

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions

Sandstone

Arenite

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Sandstone (Yellow/Siltstone variant)

Arenite (SiO2 primarily)

Limonitic Iron Ore / Goethite

Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Glauconitic Sandstone

Glauconitic Sandstone (complex silicate formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Turquoise

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

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)

Sandstone (Ferruginous)

Arenite (Fe2O3 enriched)

Limonite Concretion

Goethite-rich Concretion (FeO(OH))

Turquoise

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

Howlite (Tumbled)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2)

Turquoise

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

Sandstone

Arenite (composed primarily of SiO2)

Iron (Hematite variety)

Iron (Fe) / Hematite (Fe2O3)

Granite fragment

Granite (Felsic Plutonic Rock)

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Rough Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Green Fluorite

Fluorite (Calcium Fluoride - CaF2)

Blue Apatite

Apatite, Ca5(PO4)3(F,Cl,OH)