Chert (and Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic Gemstone (Not A Mineral)
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Chert (Grey Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Ferruginous Sandstone (with possible trace fossils)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Cavansite
Cavansite (Ca(VO)Si4O10·4H2O)
mineral
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride), Na8(Al6Si6O24)Cl2
Mineral
Gastropod Steinkern (Fossil Snail Internal Mold)
Class Gastropoda (Internal Mold)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fluorite
Calcium fluoride (CaF2)
mineral
Chrysocolla and Malachite Beads
Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)
mineral
Turquoise (Blue Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Turquoise (likely stabilized or simulated Howlite)
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Agate (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Smoky Quartz (with Hematite inclusions)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Green Tourmaline
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Moonstone
Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8
mineral
Amazonite (Green Feldspar)
Microcline (variety Amazonite), Chemical Formula: K(AlSi3O8)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Carnelian
Carnelian (Silicon Dioxide - SiO2 with iron oxide impurities)
mineral
Amazonite
Potassium Feldspar (Microcline) - K(AlSi3O8)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Potassium feldspar (Microcline), K(AlSi3O8)
mineral
Amethyst
Silicon dioxide (SiO2) containing traces of iron and manganese
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Beryl (Variety: Aquamarine/Green Beryl)
Beryllium Aluminum Silicate (Be3Al2Si6O18)
mineral
Watermelon Tourmaline
Elbaite - Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3OH
mineral
Amethyst
Silicon Dioxide (SiO2)
mineral
Rough Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Moonstone
Orthoclase Feldspar (KAlSi3O8) or Albite mixtures
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral