Man Made Object (Coin)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Quartz

Quartz (SiO₂)

Seraphinite

Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

Sandstone (likely Graywacke or Arkosic varieties)

Arenite (composed primarily of SiO2)

Limestone

Calcium Carbonate (CaCO3)

Porphyritic Basalt or Diabase with Plagioclase Phenocrysts

Porphyritic Basalt or Diabase; Mineral: Plagioclase Feldspar

Milky Quartz

Silicon Dioxide (SiO2)

Limestone (with potential fossil inclusions)

Calcium Carbonate (CaCO3)

Granodiorite (River Pebble)

Granodiorite

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Sandstone (Ferruginous)

Arenite (Fe2O3 stained)

Limestone (Grey and White specimens)

Calcium Carbonate (CaCO3)

Clear Quartz

Silicon Dioxide (SiO2)

Scoria

Scoria (a vesicular basalt or andesite)

Turquoise

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

Granite Pebble

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

Granite

Phaneritic Plutonic Felsic Rock (SiO2 > 69%)

Sandstone (likely Arkosic)

Clastic Sedimentary Rock

Limestone (specifically Dolomitic/Crystalline Limestone)

Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Granite

Granite (Felsic Plutonic Rock)

Vesicular Basalt

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Sandstone

Arenite (SiO2 based with various mineral cements)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Hematite

Iron(III) oxide (Fe2O3)

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Vesicular Basalt (Scoria)

Vesicular Basalt

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Turquoise

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

Black Pearl (Tahitian-style Cultured Pearl)

Calcium Carbonate (Aragonite) with Conchiolin (CaCO3)

Emerald and Diamond (Jewelry Setting)

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities) and Carbon (C)

Limestone

CaCO3 (Mainly Calcite or Aragonite)

Quartz

Silicon Dioxide (SiO2)

Biotite (Black Mica)

K(Mg,Fe)3AlSi3O10(OH,F)2

Quartz

Quartz (SiO₂)

Granite

Felsic Intrusive Igneous Rock

Marble

Recrystallized Calcite (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)