Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Category
Mineral Specimen
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Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Quartzite with Dendritic Manganese Oxide Inclusions
Metamorphic Quartzite (SiO2 with Mn-oxides)
metamorphic
Quartz-Tourmaline Pebble
Quartz with Tourmaline inclusions
igneous
Possible green glassy mineral pebble
Undetermined; possibly green aventurine (quartz) or another green mineral
mineral
Black tourmaline (schorl)
Schorl, a sodium–iron tourmaline; approximate formula NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Rough Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Tiger's Eye
Silicon Dioxide (Quartz pseudomorph after crocidolite), SiO2
mineral
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
mineral
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral
Tiger's Eye
Silicon dioxide with crocidolite inclusions, SiO2
gemstone
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Desert Rose
Gypsum / Barite rosette (CaSO4·2H2O)
mineral
Blue Topaz
Aluminum silicate fluoride hydroxide, Al2SiO4(F,OH)2
gemstone
Desert Rose
Gypsum crystal rosette (CaSO4·2H2O)
mineral
Dyed Halite
Sodium Chloride (NaCl)
mineral
Jasper in matrix
Microcrystalline quartz (SiO2) with impurities
sedimentary
Nugget of Native Silver
Native Silver (Ag)
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Quartz (Rose Quartz or Chert variant)
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Chalcopyrite in Gossan
Chalcopyrite (CuFeS2) in a Limonite-rich Gossan matrix
mineral
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Pyrite Sun
Iron Sulfide (FeS2)
mineral
Green Jasper on Host Rock
Microcrystalline Quartz (SiO2)
sedimentary
Rhodonite
Rhodonite (MnSiO3)
mineral