Nephrite Jade / Greenstone
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Category
Carved Stone
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Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass, SiO2 > 70%)
igneous
Yellow Jade (Nephrite or Jadeite)
Nephrite: Ca2(Mg, Fe)5Si8O22(OH)2; Jadeite: NaAlSi2O6
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Obsidian
Volcanic Glass (comprised primarily of SiO2)
Igneous
Anthracite Coal
Anthracite C
metamorphic
Pink Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Lepidolite (likely)
K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)
Mineral
Jasper and Aquamarine (likely)
Jasper (Cryptocrystalline Quartz (SiO2)), Aquamarine (Beryl (Be3Al2Si6O18))
Sedimentary (Jasper), Mineral (Aquamarine)
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Dyed Howlite (simulating Lavender/Purple Jade or Charoite)
Howlite: Ca2B5SiO9(OH)5 (when natural)
Mineral
Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
Carnelian Agate
Silicon dioxide (SiO2) with iron oxide impurities
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Obsidian
Obsidian (principally SiO2 + MgO, Fe3O4)
igneous
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Ocean Jasper
Spherulitic Chalcedony (SiO2)
mineral
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Banded Onyx (Mexican Onyx / Travertine)
Calcite (CaCO3) - Banded Travertine
sedimentary
Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Jade
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
gemstone
Spinel
Magnesium aluminum oxide (MgAl2O4)
gemstone
Obsidian
Obsidian (Amorphous volcanic glass, SiO2 rich)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
Igneous
Obsidian
Volcanic Glass (Primary component: SiO2)
igneous
Carnelian
Carnelian (a variety of Chalcedony), SiO2 (Silicon Dioxide)
mineral
Obsidian
Volcanic Glass (SiO2 dominant)
igneous
Carnelian (Red Chalcedony)
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Basalt
Basalt
Igneous
Red Tiger's Eye beads
Tiger's Eye (variety of Chalcedony, SiO2)
Mineral / Gemstone (variety of Quartz)
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Fluorite
Calcium fluoride, CaF2
Mineral
Fluorite
Calcium Fluoride (CaF2)
Mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Calcite (likely a tumbled specimen)
Calcite (CaCO 3 )
Mineral
Sandstone
Arenite (general term for sandstone)
Sedimentary Rock
Ocean Jasper
Orbicular Jasper (variety of Chalcedony - SiO2)
Mineral
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Mineral
Onyx (beads)
SiO2 (Cryptocrystalline Quartz)
Mineral