Mineral (Pseudomorph)

Hematite

Hematite (Fe2O3)

Sandstone (Ferruginous)

Arenite (Fe-oxide enriched)

Turquoise

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

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Goethite/Limonite Iron Ore Node

Goethite (FeO(OH)) or Limonite (mixture of hydrated iron oxides)

Turquoise with Pyrite

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O] with Iron Pyrite (FeS2)

Magnetite

Magnetite (Fe3O4)

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Sandstone (likely Arkosic)

Arenite (SiO2 based)

Mica Schist

Schist (primarily Muscovite and Biotite mica)

Sandstone (likely Arkose or Lithic)

Clastic sedimentary rock (SiO2 + impurities)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Sandstone (Ferruginous)

Arenite with Iron Oxides

Chert with Calcite Veins

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions

Turquoise

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

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

High-grade regional metamorphic rock (Foliated)

Likely polished basalt with pale mineral inclusions

Basalt; inclusions possibly calcite, quartz, or weathered feldspar

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock (Basalt)

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz/chalcedony with iron-oxide-rich orbicules; commonly called Ocean Jasper

Quartz Pebble (with Iron Inclusions)

Silicon Dioxide (SiO2)

Fluorite Geode

Calcium Fluoride (CaF2)

Chalcedony (Botryoidal Agate vein)

Chalcedony (Microcrystalline Quartz) - SiO2

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Sandstone Concretion (Omar or Nut Rock)

Sedimentary Concretion (specifically an 'Omarolluk' or Omar)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Fluorite (Rainbow or Multi-colored Fluorite)

Fluorite (Calcium Fluoride - CaF2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Malachite

Copper carbonate hydroxide, Cu2CO3(OH)2

Greenstone / Greenschist

Greenschist facies metamorphic rock (composed primarily of chlorite, actinolite, and epidote)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz geode

Microcrystalline quartz and drusy quartz (SiO₂), commonly lining a chalcedony-rich cavity

Sandstone (Weathered Cobble)

Clastic sedimentary rock (primarily SiO2)

Epidosite

Epidosite (Metasomatic rock consisting mainly of Epidote and Quartz)

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Moss Agate

Chalcedony (Silicon Dioxide) with Chlorite or Iron/Manganese inclusions (SiO2)

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Pegmatite

Igneous Pegmatite

Quartz Pebble

Silicon Dioxide (SiO2)

Greenstone (Amygdaloidal Basalt)

Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)