Mineral Specimen

Concrete

Hydrated Portland Cement Aggregate Composite

Gold Nugget

Native Gold (Au)

Banded Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Clear Quartz

Silicon Dioxide (SiO2)

Greywacke (River Slikkenstone)

Greywacke (Impure Sandstone)

Rough Quartz (likely Rose or Amethyst variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Green Moss Agate

Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Smoky Quartz on Matrix

Silicon Dioxide (SiO2) with trace impurities and aluminum inclusions

Bull Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Dyed Pink Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Jasper (Iron Oxide Rich)

Silicon Dioxide (SiO2) with Fe2O3 (Hematite/Goethite) inclusions

Banded Agate (specifically Lake Superior Agate type)

Silicon Dioxide (SiO2) - Microcrystalline Chalcedony

Milk Quartz (River Pebble)

Quartz (Silicon Dioxide, SiO2)

Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz / Clear Quartz

Silicon Dioxide (SiO2)

Blue Celestite (Celestine) Cluster

Strontium sulfate (SrSO4)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Glauconitic Sandstone (Greensand pebble)

Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Clear Quartz

Silicon Dioxide (SiO2)

Wishing Stone (Quartz-veined Siltstone or Graywacke)

Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)

Rose Quartz

Silicon dioxide with traces of titanium, iron, or manganese (SiO2)

Blue Caribbean Calite

Calcium Carbonate (CaCO3) with trace Aragonite

Apatite

Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Calcite

Calcite (CaCO3)

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Muscovite Mica (in Quartz/Feldspar Matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Yellow Quartzite (Beach Pebble)

Quartzite (primarily SiO2)

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Granite (Weathered)

Plutonic Igneous Rock (Granitic)

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Limestone with Quartz or Calcite Veining

Calcium Carbonate (CaCO3) matrix with SiO2 or CaCO3 inclusions

Pink Granite with Quartz Vein

Phaneritic Plutonic Felsic Rock (K-feldspar + Quartz + Plagioclase + Mica)

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite (on host rock/ore)

Iron Sulfide (FeS2)

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)