Feldspar (likely Orthoclase or Plagioclase)
Tectosilicate Feldspar (KAlSi3O8 to (Ca,Na)(Al,Si)4O8)
mineral
Category
Mineral, Jewelry
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Pyrite
Iron Sulfide (FeS2)
mineral
Septarian Nodule
Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Tumbled Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Tiger Iron
Composite rock (Quartz, Tiger's Eye, Hematite, and Jasper)
metamorphic
Hemimorphite or Red Quartz
SiO2 (Quartz) / Zn4Si2O7(OH)2·H2O (Hemimorphite)
mineral
Tumbled Agate
Silicon Dioxide (SiO2)
gemstone
Epidote
Ca2(Al,Fe)3(SiO4)3(OH)
mineral
Green Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Fulgurite
Lechatelierite (Silica glass tubes)
mineral
Bumblebee Jasper
Fibrous Calcite and Quartz with Volcanic Matter (CaCO3 / SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Lake Superior Agate
Silicon Dioxide (Chalcedony/Quartz), formula SiO2
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Pyrite Cube in Matrix
Iron Sulfide (FeS2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chocolate Jasper
Microcrystalline Quartz (SiO2) with impurities
sedimentary
Amethyst (or Rose Quartz)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2 with iron impurities)
mineral
Tektite
Impactite (Natural Silicate Glass)
meteorite
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Banded Agate
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8
mineral
Banded Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Quartz Geode / Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Epidote with Quartz
Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)
mineral
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Amazonite
K(AlSi3O8) - Lead-bearing Microcline
mineral
Raw Sunstone
Sunstone (Feldspar variety, (Ca,Na)((Al,Si)2Si2O8))
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2) with ferric iron impurities
gemstone
Moonstone (Feldspar)
Orthoclase Feldspar KAlSi3O8 / Albite NaAlSi3O8
gemstone
Imperial Topaz
Al2SiO4(F,OH)2
mineral