Gossan (with secondary copper minerals)
Iron-rich oxidized rock cap (Limonite/Goethite with Malachite/Chrysocolla inclusions)
metamorphic
Category
Mineral (Refined Metal)
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Gold-bearing quartz vein specimen
Native gold (Au) in quartz (SiO₂), likely with iron-oxide staining
mineral
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, and Chrysotile, (Mg,Fe)3Si2O5(OH)4)
metamorphic
Black Onyx
Cryptocrystalline Quartz (SiO2) with impurities
mineral
Cubic Zirconia (Simulated Diamond)
Cubic Zirconia (ZrO2)
mineral
Blue Sapphire
Corundum (Al2O3 with trace amounts of iron and titanium)
mineral
Faceted Peach Morganite (Beryl)
Morganite (Be3Al2Si6O18 with trace Manganese)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Dyed Blue Agate (Slab)
Agate (Variety of Chalcedony/Microcrystalline Quartz), SiO2
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Titanium Coated Kyanite (Aura Kyanite)
Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating
metamorphic
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Quartz Vein in Host Rock (Pebble)
Quartz (SiO2) with sandstone or siltstone matrix
metamorphic/igneous transition
Mica Schist (with Muscovite mica)
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Granite featuring Quartz Vein
Granite with hydrothermal silica (SiO2) intrusion
igneous
Ironstone Matrix with Jasper / Chert
Ferruginous Chert / Limonitic Jasper (SiO2 with Fe-oxides)
sedimentary
Granite
Phaneritic Igneous Rock (Granite)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
Mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Likely iron-rich chert or jasper
Microcrystalline quartz (SiO₂), variably stained by iron oxides/hydroxides
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lithium-bearing Mica)
mineral
Serpentinite
Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)
metamorphic
Quartzite with vugs/druzy quartz
Crystalline Silicon Dioxide (SiO2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Hematitic Sandstone
Sandstone with Iron Oxide (Hematite) staining
sedimentary
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Carbonaceous Chondrite (CV3 type)
Carbonaceous Chondrite (CV3 group)
meteorite
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Pyrite
Iron Sulfide (FeS2)
mineral