Chert (Green and Black Jasper variant)
Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Synthetic Or Natural Fiber
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Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Jasper
Silicon Dioxide (SiO2)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities
mineral
Green Aventurine
Aventurine Quartz (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Sandstone
Arenite
sedimentary
Diamond
Cubic carbon (C)
mineral
River Cobble (likely Basalt or Greenstone)
Mafic Igneous Rock (with possible chloritic alteration)
igneous
Dyed Agate
Silicon Dioxide (SiO2) with artificial colorants
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Diamond (Faceted)
Carbon (C) - Diamond
mineral
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Citrine
Silicon dioxide (SiO2) - yellow quartz variety
mineral
Yellow Quartz (Citrine or Citrine-colored Quartz)
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Quartz (Smoky/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz with Amethyst
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Jasper
Chert (Silica: SiO2)
sedimentary
Tektite
Tektite (high-silica natural glass)
Mineraloid
Ametrine
Silicon Dioxide (SiO2) with impurities of iron
mineral
Chevron Amethyst
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Black Onyx
Cryptocrystalline Quartz (SiO2 with organic/iron impurities)
mineral
Shiva Lingam
Cryptocrystalline Quartz (Jasperiod Silicate with Iron Oxide inclusions)
sedimentary
Moonstone (Feldspar)
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rough Diamond
Diamond (C)
mineral
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
Igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica/Amphibole)
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Diamond
Carbon (C)
mineral