Garnet
Garnet group species (likely Almandine, Fe3Al2(SiO4)3)
mineral
Category
Man Made Object (Metalwork)
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Apache Tear
Obsidian (Hydrated Silica / Amorphous Volcanic Glass)
igneous
Dalmatian Stone
Peralkaline rhyolite with arfvedsonite inclusions
igneous
Rough Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Greenstone / Greenstone Pebble
Greenschist (metamorphosed basalt or gabbro)
metamorphic
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Mineral
Jadeite Jade
Jadeite (NaAlSi2O6)
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Pink Feldspar
Orthoclase (KAlSi3O8) or Microcline
mineral
Sandstone
Sedimentary Clastic Rock
sedimentary
Diamond (in jewelry)
Diamond (Carbon, C)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Serpentinized ultramafic rock with magnesite
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with likely magnesite (MgCO₃) and minor chromite/magnetite
metamorphic
Granite Pebble
Granite
igneous
Granite
Granite (Plutonic Igneous Rock)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Olivine in Quartz/Feldspar Matrix (Peridotite or Granitic Pegmatite)
(Mg,Fe)2SiO4 (Olivine) with Quartz / Feldspar
igneous
Jasper (Green)
Silicon dioxide (SiO2)
Mineral/Sedimentary
River Sandstone (Lithic Arenite)
Lithic Sandstone (SiO2 dominated with lithic fragments)
sedimentary
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Serpentinized ultramafic rock (serpentinite)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chromite, talc, and carbonate
metamorphic
Rose quartz (likely)
Quartz, silicon dioxide (SiO₂), pink variety
mineral
Granite
Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)
igneous
Greenstone
Greenschist (metamorphosed mafic igneous rock)
metamorphic
Milky quartz vein fragment
Quartz (silicon dioxide, SiO₂), massive/microcrystalline variety
mineral
Sandstone (with minor quartz and possible clay components)
Clastic Sedimentary Rock (SiO2 dominated)
sedimentary
Sandstone
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Clear quartz cabochon
Quartz (silicon dioxide, SiO₂)
gemstone
Weathered basalt or iron-rich volcanic rock
Mafic volcanic rock, likely basalt; exact identification requires testing
igneous
Polished ocean jasper (orbicular jasper), likely
Silica-rich microcrystalline quartz/chalcedony aggregate, commonly with feldspar, epidote, and iron oxides; composition varies
igneous
Magnetite or Hematite (Iron Stone)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Siltstone River Rock
Siltstone (composed of silt-sized particles, silicate minerals)
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2 with Iron Oxide impurities)
sedimentary
Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Unakite
Epidotized Granite
metamorphic
Botryoidal Quartz
Silicon Dioxide (SiO2)
mineral
Jasper Conglomerate
Jasperoid Conglomerate (predominantly SiO2 with iron oxide impurities)
sedimentary
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous