Travertine (Tufa)
Terrestrial Sedimentary Limestone (CaCO3)
sedimentary
Category
Synthetic Or Natural Fiber
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Rough Diamond
Carbon (C)
mineral
Limonite Pseudomorph after Pyrite
Goethite/Limonite FeO(OH)·nH2O replacing Pyrite FeS2
mineral
Limonitic Iron Ore / Goethite
Hydrated Iron(III) oxide-hydroxide (primarily FeO(OH)·nH2O)
sedimentary
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
sedimentary
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Dream Amethyst (Chevron Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Red Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Obsidian
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Banded Agate (specifically Gobi Eyes or Eye Agate)
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Citrine Geode Fragment
Citrine (Silicon Dioxide with Iron Impurities), SiO2
mineral
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Garden Quartz (Phantom Quartz)
Silicon Dioxide (SiO2) with various inclusions (often Chlorite, Hematite, or Iron)
mineral
Magnetite (Lodestone)
Iron(II,III) oxide (Fe3O4)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Earth
Terra / Earth
igneous, sedimentary, and metamorphic
Chalcopyrite
Chalcopyrite (CuFeS2)
mineral
Gossan (with Limonite and Hematite)
Goethite (FeO(OH)), Limonite (FeO(OH)·nH2O), and Hematite (Fe2O3)
sedimentary
Jasper and Yellow Chert (Tumbled)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite river stone
Quartzite (mostly SiO2)
metamorphic
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Jasper-bearing Quartzite River Cobble
Tectonized Quartzite with Iron-Oxide (Hematite/Limonite) Veining
metamorphic
Smoky Quartz (with Hematite inclusions)
Silicon Dioxide (SiO2)
mineral
Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral
Dyed Agate Geode (Pink/Magenta)
Silicon Dioxide (SiO2) - variety of Chalcedony/Quartz
mineral
Granite
Granite (a phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
igneous
Granite
Granite (compositional mixture of Quartz, Feldspar, and Mica)
igneous
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Goldfish Cracker (Culinary Mimic)
Cibus aurum (Commonly composed of Enriched Wheat Flour and Cheddar Cheese)
Anthropogenic Sedimentary-style Organic Solid
Picture Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Magnetite
Magnetite (Fe3O4)
Mineral
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions (Quartzite)
metamorphic