Greenschist (Greenstone)
Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)
metamorphic
Category
Man Made Object (Metalwork)
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Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Iceland Spar (Optical Calcite)
Calcite (CaCO3)
mineral
Crackled Quartz (Blue Dyed)
Silicon Dioxide (SiO2) with anthropogenic dye
mineral
Chert (Jasper / Quartz pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert Arrowhead (Lithic Tool)
Microcrystalline quartz (SiO2) - Archeological lithic artifact
sedimentary
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chalk
CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock
Sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Common Marble
Calcium Carbonate (CaCO3)
metamorphic
Chert (and Jasper/Flint variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Polished copper-bearing mineral specimen, likely malachite-rich copper ore
Malachite, Cu₂CO₃(OH)₂, possibly mixed with chrysocolla or limonite
mineral
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Smurf Rock (Fictional Interpretation)
Cyanus Anthropomorphicus (Geologic Simulation)
Artificial/Fantasy Object
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Ironstone (Limonitic Sandstone)
Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)
sedimentary
Tumbled brown chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Selenite (gypsum)
Gypsum, CaSO₄·2H₂O; variety commonly called satin spar or selenite
mineral
Tumbled brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide inclusions
mineral
Obsidian (likely blue-sheen or coated obsidian)
Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)
igneous
Polished dark-green stone, possibly serpentine or nephrite jade
Serpentine-group minerals, commonly antigorite/lizardite; possible nephrite (actinolite–tremolite amphibole)
metamorphic
Polished red jasper pebble
Jasper, microcrystalline quartz (SiO₂) colored mainly by hematite/goethite
metamorphic
Blue-green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Polished carnelian/chalcedony
Carnelian, a red-orange variety of microcrystalline quartz (SiO₂)
gemstone
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
mineral
Tumbled quartz pebble
Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz
mineral
Tumbled carnelian
Carnelian, orange-red variety of cryptocrystalline chalcedony (SiO₂)
gemstone
Blue lace agate (tumbled)
Microcrystalline quartz, SiO₂ (chalcedony variety)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Tumbled nephrite jade (likely)
Nephrite jade; fibrous amphibole aggregate, chiefly actinolite–tremolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂
metamorphic
Red jasper fragment
Jasper, microcrystalline quartz (SiO₂) colored chiefly by iron oxides
mineral
Sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Labradorite
Plagioclase Feldspar ((Na,Ca)(Al,Si)4O8)
mineral
Charoite
K(Ca,Na)2Si4O10(OH,F)wH2O
mineral