Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Category
Mineral, Jewelry
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Emerald in Matrix
Emerald (Beryllium Aluminum Silicate - Be3Al2(SiO3)6)
mineral
Lake Superior Agate
Silicon Dioxide (Cryptocrystalline Quartz), SiO2
mineral
Banded Agate with Drusy Quartz
Cryptocrystalline Quartz (SiO2) with macrocrystalline Quartz
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Microcline (KAlSi3O8) with Pb impurities
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon dioxide (SiO2)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Fire Opal (in Matrix)
Hydrated Silica (SiO2·nH2O)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Ca,Na)(Al,Si)4O8
mineral
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Amazonite
KAlSi3O8 (Potassium aluminum silicate - blue-green variety of Microcline)
mineral
Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Prehnite
Prehnite, Ca2Al2Si3O10(OH)2
mineral
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Potassium Feldspar)
mineral
Tiger's Eye
Fibrous Quartz (SiO2) with iron inclusions
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Vesuvianite (Idocrase)
Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Petrified Wood
Silicified wood (SiO2)
fossil
Hematite
Hematite (Fe2O3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Poppy Jasper
Silicon Dioxide (SiO2) with Hematite and Iron Oxide inclusions
sedimentary
Fossil brachiopod shell
Brachiopoda; exact genus/species indeterminate
fossil
Onyx
Chalcedony (SiO2)
mineral
Polished hematite pebble
Hematite, Fe₂O₃
mineral
Hematite (likely Botryoidal or Specularite variant)
Iron(III) oxide (Fe2O3)
mineral
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O)
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
White quartz bead bracelet (likely milky quartz)
Quartz, silicon dioxide (SiO₂), usually microcrystalline or cloudy crystalline quartz
mineral
Chrysoprase
Chalcedony with nickel impurities (SiO2)
gemstone
Small pale mineral fragment
Unidentified; possibly quartz, calcite, or feldspar
mineral
Polished agate geode slice
Microcrystalline quartz (chalcedony), SiO₂, with possible quartz-lined or calcite-filled cavity
mineral
Costume Jewelry Gemstones (Emerald-imitation and semi-precious beads)
BeCuAl6Si6O18 (Beryl structure), frequently simulated by glass or synthetic spinel
mineral
Red Jade (Dyed Quartzite)
Silicon Dioxide (SiO2) - variety Quartzite
metamorphic
Aquamarine (Pendant) and Jasper (Beads)
Beryllium aluminum silicate (Be3Al2Si6O18) with Chalcedony (SiO2)
mineral