Smoky Quartz with Calcite/Quartz Veining
Silicon Dioxide (SiO2)
mineral
Category
Not A Natural Rock
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Smoky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Pearl (Biogenic)
Nacre / Calcium Carbonate (CaCO3)
mineral
Quartz (Citrine or Iron-stained variety)
Silicon Dioxide (SiO2)
mineral
Diamond (or Cubic Zirconia)
Crystallized Carbon (C) for Diamond; Zirconium Dioxide (ZrO2) for CZ
mineral
Rhodochrosite (Beads) and Citrine (Pendant)
Rhodochrosite (MnCO3) and Quartz variety Citrine (SiO2)
mineral
Rutilated quartz bead bracelet
Quartz, silicon dioxide (SiO₂), with rutile inclusions (TiO₂)
mineral
Diamond (Baguette cut)
Carbon (C)
gemstone
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Carnelian Agate
Silicon Dioxide (SiO2)
gemstone
Cubic Zirconia (Faceted Gemstone)
Zirconium dioxide (ZrO2)
gemstone
Mixed Agate and Lapis Lazuli Bracelet
Chalcedony (SiO2) and Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
sedimentary and metamorphic
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Diamond
C (Carbon)
mineral
Pearl
Nacre (Aragonite and Conchiolin), CaCO3
mineral
Orange Calcite / Quartzite with Iron Staining
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) with Iron Oxide impurities
mineral
Mixed River Pebbles
Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts
sedimentary
Sandstone
Arenite
sedimentary
Iron Ore / Hematite / Ironstone Nodule
Hematite / Goethite (Fe2O3 / FeO(OH))
sedimentary
Moqui Marble
Hematite-Goethite Concretion
sedimentary
Gold-bearing Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Hag Stone
Perforated Sandstone (composed of SiO2 and calcareous cement)
sedimentary
Snowflake Obsidian
Vitreous volcanic rock with Cristobalite inclusions (mostly SiO2)
igneous
Veined Limestone (Micrite) with Quartz/Calcite Veins
Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions
sedimentary
Vesicular basalt (likely scoria)
Vesicular basalt; chiefly plagioclase, pyroxene, olivine, and iron oxides
igneous
Polished brecciated jasper
Jasper, opaque microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide and dark silicate inclusions
mineral
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
Igneous
Granite
Intrusive Igneous Rock
igneous
Diamond
Carbon (C)
mineral
Citrine
Silicon Dioxide (SiO2)
Mineral
Amber
Fossilized Tree Resin (C10H16O)
gemstone
Quartz Pebble (Beach Agate / Chalcedony Pebble)
Silicon Dioxide (SiO2)
mineral
Polished brecciated jasper pebble
Microcrystalline quartz (SiO₂), with iron-oxide inclusions
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Diamond
Native Carbon (C)
gemstone
Sandstone Flagstone
Quartz Arenite Sandstone
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone