Mineral Based Alloy (Anthropogenic)

Basalt with Epidote Veining

Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)

Basalt

Aphanitic Mafic Igneous Rock

Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Graphite

Graphite (Native Carbon, C)

Blue Quartzite (Dyed)

Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)

Basalt

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 in Matrix)

Basalt with Limonite stains

Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)

Fuchsite (Green Muscovite in Quartz)

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Mica Schist with Quartz

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Mica Schist

Mica Schist (primarily Muscovite or Biotite Schist)

Citrine Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Dendritic Opal

Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions

Tree Agate (Dendritic Agate/Quartz)

Silicon Dioxide (SiO2) with trace Manganese or Iron oxide inclusions

Biotite (Black Mica)

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

Fuchsite

Chromium-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]

Mica

Phlogopite or Biotite group (KMg3(AlSi3O10)(F,OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Opal

Hydrated amorphous form of silica (SiO2·nH2O)

Tree Agate

SiO2

Lepidolite

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

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3/FeO(OH))

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

Fossiliferous Shale

Laminated Mudrock with plant fossils

Biotite Schist

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

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2)

Fragmented Sedimentary Pebble

Clastic Sedimentary Specimen

Vesicular Basalt with Calcification

Vesicular Basalt (Aphanitic extrusive igneous rock)

Aura Quartz (Titanium/Gold coated)

Silicon Dioxide (SiO2) with metallic vapor deposition

Citrine (likely Heat-Treated)

Quartz (Silicon Dioxide, SiO2)

Ironstone Concretion (Moqui Marble Type)

Goethite/Hematite-cemented Sandstone Concretion

Pink Granite

Phaneritic Felsic Igneous Rock

Granitoid (Granite/Gneiss)

Granitoid silicate rock, primarily quartz and feldspar

Granite

Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Vesicular Basalt with Amygdaloidal Infill

Basalt (Mafic Extrusive Igneous Rock)

Dendritic Agate (Tree Agate)

Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions

Atlantic Calico Scallop (Biogenic Aragonite/Calcite)

Argopecten gibbus (Chemical: CaCO3)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide

Moss Agate

Chalcedony (Silicon Dioxide, SiO2) with dendritic inclusions

Fuchsite

K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)