Sedimentary (Processed Mineral Product)

Limestone

Calcium Carbonate (CaCO3)

Chevron Amethyst

Silicon Dioxide (SiO2) with iron impurities

Kyanite (Green and Blue varieties)

Kyanite (Al2SiO5)

Banded Chert

Microcrystalline Quartz (SiO2)

Fuchsite

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

Botryoidal Goethite

Goethite (α-Fe3+O(OH))

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Coal (likely Anthracite)

Anthracite coal

Biotite Schist

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

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Amethyst (Tumbled/Water-worn)

Silicon Dioxide (SiO2)

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2)

Kyanite (within Quartz)

Kyanite (Al2SiO5) in crystalline Quartz base (SiO2)

Seraphinite

Clinochlore (Mg,Fe2+)5Al(Si3Al)O10(OH)8

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Turquoise and Hematite

Turquoise: CuAl6(PO4)4(OH)8·4H2O; Hematite: Fe2O3

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

Magnetic Hematite

Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)

Limestone

Calcium Carbonate (CaCO3)

Gold-bearing Quartz Vein in Mafic Rock

Hydrothermal Quartz Vein within Greenschist/Amphibolite facies (SiO2 with Au)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2) with iron oxide inclusions

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Quartzite

Quartzite (primarily SiO2)

Chalk

Calcium Carbonate (CaCO3)

Pink Granite

Phaneritic intrusive igneous rock with dominant Alkali Feldspar

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Beach Quartzite Pebble

Quartzite (primarily SiO2)

Granite (White Granite variant)

Phaneritic Plutonic Rock (High-silica Felsic)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Stichtite (often found in Serpentinite)

Stichtite Mg6Cr2CO3(OH)16·4H2O

Kyanite (in Schist Matrix)

Kyanite (Al2SiO5)

Granite

Phaneritic Felsic Igneous Rock

River Stone (likely Siltstone or fine-grained Basalt)

Clastic Sedimentary (Siltstone) or Mafic Igneous (Basalt)

Limestone

Calcium Carbonate (CaCO3)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Zircon

Zirconium Silicate (ZrSiO₄)

Bauxite (Aluminum Ore)

Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)

Granite

Granitoid (dominated by Quartz and Feldspar)

Marble

Marble (primarily Calcite, CaCO3 or Dolomite, CaMg(CO3)2)

Blue Kyanite

Kyanite (Al2SiO5)

Siltstone

Siltstone (primarily composed of microcrystalline Quartz and Feldspar)