Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
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Diamond
Carbon (C)
mineral
Citrine Quartz
Crystalline Quartz (SiO2 with iron impurities)
mineral
White Quartz Star-cut crystal
Silicon Dioxide (SiO2)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Granite Pegmatite with Tourmaline and Muscovite
Pegmatite (Feldspar: KAlSi3O8, Quartz: SiO2, Schorl: NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH))
igneous
Yellow Diamond (Faceted)
Diamond (pure carbon) with nitrogen impurities, C
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Sapphire
Corundum (Al2O3)
mineral
Limonite (Iron Ore)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
Mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Green Tourmaline
Elbaite - Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4
mineral
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Orange Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Native Copper (Penny specimen)
Native Copper (Cu)
mineral
Hematite
Hematite (Fe2O3)
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Agate (River Pea)
Microcrystalline Chalcedony (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Banded Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Diamond
Carbon (C)
mineral
Granitic Pegmatite (Muscovite and Quartz)
Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)
igneous
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Ferruginous Quartz (River Pebble)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary (secondary classification for a weathered mineral specimen)
Mica Schist
Schist (muscovite-biotite schist)
metamorphic
Diamond
Carbon (C)
mineral
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
mineral (synthetic)
Coal (Anthracite/Bituminous)
Carbo fossilium (primarily Carbon)
sedimentary
Diamond in Gold Setting
Diamond (C - pure carbon)
mineral
Quartz (Tumbled/Polished Pebble)
Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
mineral