Cubic Zirconia (Faceted)
Zirconium dioxide (ZrO2)
gemstone
Category
Industrial Byproduct (Anthropogenic Material)
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Likely weathered river pebble
Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert
sedimentary
Iron-stained Quartz Vein
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Diamond
Carbon (C)
gemstone
Quartz vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Lithic Matrix
metamorphic
Rough Black Diamond (Bort / Carbonado)
Diamond (C)
mineral
Cubic Zirconia (CZ)
Cubic Zirconium Dioxide (ZrO2)
gemstone
Diamond
Carbon (C)
gemstone
Dark river pebble, likely basalt or fine-grained volcanic rock
Basalt (probable); mostly plagioclase and pyroxene, with possible magnetite
igneous
Chert (Grey-Green Var.)
Silicon Dioxide (SiO2)
sedimentary
Water and Silt (Sedimentary Environment)
Suspended Sediment / H2O (dihydrogen monoxide)
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Granitoid (Granitic Rock)
Granitoid (Quartzo-feldspathic plutonic rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Diamond
Native Carbon (C)
gemstone
Quartz-lined vesicle in basalt (amygdaloidal basalt)
Amygdaloidal basalt with drusy quartz; predominantly plagioclase, pyroxene, and iron oxides
igneous
Iron-stained weathered stone (tentative)
Undetermined; possibly weathered iron-rich basalt or concretion
mineral
Brecciated jasper (likely ocean jasper or rhyolitic jasper)
Silica-rich volcanic breccia composed mainly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and possible feldspar
igneous
Weathered agate or chalcedony nodule
Microcrystalline quartz (SiO₂), likely agate/chalcedony with iron-oxide staining
mineral
Fossil brachiopod shell
Likely spiriferid or strophomenid brachiopod; calcium carbonate (primarily calcite)
fossil
K-Feldspar (Potassium Feldspar)
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper/Limonitic Chert)
Cryptocrystalline Quartz (SiO2) with Iron Oxide (FeO(OH)) inclusions
sedimentary
Ferruginous Sandstone
Clastic Sedimentary Rock (Sandstone with Iron Oxide cement)
sedimentary
Peridotite (with Olivine)
Peridotite (dominantly (Mg, Fe)2SiO4)
igneous
Peridotite
Peridotite (varieties include Dunite, Lherzolite, Harzburgite)
igneous
Olivine (Peridot)
Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Sandstone with Algae Growth
Arenite with Chlorophyta/Lichen
sedimentary
Quartzite Breccia
Brecciated Quartzite (SiO2)
metamorphic
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
mineral
Granodiorite
Granodiorite
igneous
Limestone (Cliff Formation)
Limestone (predominantly CaCO3 as calcite)
Sedimentary
Quartzite
Quartzite (predominantly SiO2)
metamorphic
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Amethyst cluster
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Andesite
Andesite (Intermediate Extrusive Volcanic Rock)
igneous
Basalt
Basalt (Volcanic Mafic Rock)
igneous