Ferruginous Conglomerate
Ferruginous Conglomerate (Clastic Sedimentary Rock)
sedimentary
Category
Synthetic Or Natural Fiber
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Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Black Onyx
Silicon dioxide (SiO2) with parallel banded structure
Mineral (variety of chalcedony)
Schist
Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Crystalline Quartz
mineral
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Smoky Quartz on Matrix
Crystalline Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Smoky Quartz (Tumbled)
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Apache Tear (Obsidian)
Obsidian / Amorphous Volcanic Glass (primarily SiO2)
igneous
Dyed Quartzite
Tumbled Metamorphosed Quartz (SiO2) with artificial pigment
metamorphic
Sandstone
Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)
Sedimentary Rock
Amethyst
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Quartzite
Quartzite (primarily SiO2)
Metamorphic
Blue Agate (Dyed)
Silicon Dioxide (SiO2)
Sedimentary (formed from silica deposits)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Turquoise and Spiny Oyster (Heishi style beads)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Spondylus (Spiny Oyster shell)
mineral and organic gemstone
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chrysocolla
Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Peach Moonstone Sphere
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Red Coral (with Hematite and Black Pearl accents)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Gold Nugget
Native Gold (Au)
mineral
Glauconitic Sandstone (Greensand)
Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Dyed Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Banded Quartzite River Pebble
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Diorite (Spotted or Dalmatian Stone effect)
Diorite (Intermediate Plutonic Rock)
igneous
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Pearl (Imitation or Cultured)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
Mineraloid (Organic)
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Moldavite
Silica glass with small amounts of aluminum, iron, and other elements
Mineraloid / Tektite