Blue Quartz (Dumortierite Quartz)
SiO2 with inclusions of AlAl6BSi3O18
mineral
Category
Synthetic Or Natural Fiber
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Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Green Quartzite (or Green Jasper)
Silica (Silicon Dioxide, SiO2) with inclusions
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Citrine Quartz (Yellow Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Magnetite (or Magnetic Iron Ore)
Magnetite (Fe3O4)
mineral
Pink Granite
Phaneritic Felsic Igneous Plutonic Rock
igneous
Covellite
Covellite (CuS)
mineral
Druzy Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral
Chatoyant Quartz (Cat's Eye Quartz)
Silicon Dioxide (SiO2) with fibrous inclusions of Amphibole or Rutile
mineral
Quartz (Gray/Smoky Variety)
Silicon Dioxide (SiO2)
mineral
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Basalt (Polished River Stone)
Aphanitic Mafic Igneous Rock
igneous
Heat-Treated Citrine
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale
Mudstone/Shale
sedimentary
Quartz (Double-Terminated)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Basalt (Polished)
Basalt (Mafic Extrusive Igneous Rock)
Igneous
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Kimberlite
Kimberlite (Potassic ultramafic igneous rock)
igneous
Dyed Blue Agate Geode Slice
Chalcedony (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral
Granite
Granite (Alkali feldspar, Plagioclase feldspar, and Quartz)
igneous
Moissanite
Silicon Carbide (SiC)
mineral
Granite
Granite (Felsic Plutonic Rock)
Igneous
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Blue Dyed Agate
Chalcedony (SiO2) with artificial pigment
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Ruby (Raw Corundum)
Corundum (Al2O3 with Chromium impurities)
mineral
Raw Diamond (Rough Uncut)
Diamond (C - pure carbon)
mineral
Granite Pebble
Phaneritic plutonic rock (SiO2 primary)
igneous
Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Yellow Quartz (Citrine or Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Blue Sphalerite (likely dyed or treated Druzy Quartz/Agate)
Zinc Sulfide (ZnS) or Silicon Dioxide (SiO2) with trade-name enhancement
Mineral
Yellow Quartz (Citrine Quartzite)
Silicon Dioxide (SiO2)
metamorphic
Moonstone
Orthoclase Feldspar (containing Albite lamellae), (KAlSi3O8)
mineral