Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Category
Synthetic Or Natural Fiber
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Ruby
Corundum (Al2O3 with Chromium trace impurities)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Tiger's Eye (Rough)
Macrocrystalline Quartz (SiO2 with inclusions of Crocidolite)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Serpentine (Serpentinite)
Antigorite, Lizardite, and Chrysotile: (Mg,Fe)3Si2O5(OH)4
metamorphic
Clear Quartz crystals on a Matrix base (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Basalt
Mafic Igneous Rock
igneous
Basalt
Basalt (containing Pyroxene, Plagioclase feldspar, and Olivine)
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Basalt with Vesicular Texture
Basalt (SiO2 range 45-52%)
igneous
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Digital Multimeter (Synthetic Object)
Digital Multimeter (DMM)
not a rock
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Bituminous Coal (with Anthracite or Vitrinite inclusion)
Organic-rich Sedimentary Rock (Carboniferous classification)
sedimentary
Falcon's Eye (Blue Tiger's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Crazy Lace Agate
Cryptocrystalline Quartz (Silicon Dioxide, SiO2)
mineral
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)
metamorphic
Tiger's Eye
Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2
metamorphic
Tiger's Eye
Pseudomorph of quartz after crocidolite (SiO2 with iron inclusions)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Tiger's Eye (Nodule/Tumbled)
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Rose Quartz
Silicon dioxide (SiO2)
mineral
Serpentine
Serpentinite (group of minerals based on (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Blue Tiger's Eye
Silicon Dioxide (SiO2) with Crocidolite inclusions
Mineral (Pseudomorph)
Chert (White Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of Crocidolite (Asbestos) replaced by Quartz
metamorphic
Tiger's Eye
Silicon dioxide (SiO2) - Pseudomorph after crocidolite
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Chert (Gravel specimen)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Basalt
Mafic volcanic rock (formula mostly SiO2, MgO, FeO)
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral