Greenstone (Epidote/Chlorite-rich Metabasalt)
Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
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Red Jasper
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
sedimentary
Conch Pearl
Calcareous concretion (CaCO3)
mineraloid
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Malachite
Copper Carbonate Hydroxide, Cu2CO3(OH)2
mineral
Limonite
FeO(OH)·nH2O
mineral
Amethyst Quartz
Silicon Dioxide (SiO2 with iron impurities)
mineral
Rounded river stone, likely basaltic or volcanic rock
Fine-grained mafic volcanic rock, possibly basalt (exact identification requires testing)
igneous
Schist
Mica Schist
metamorphic
Dyed or coated quartz geode
Quartz geode; silicon dioxide (SiO₂), likely artificially color-enhanced
mineral
Weathered green-gray stone, likely serpentinite or chlorite-rich metamorphic rock
Probable serpentinite (antigorite–lizardite), possibly chlorite schist or altered basalt
metamorphic
Banded Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Amethyst
SiO2 (Silicon Dioxide) - Purple variety of Quartz
mineral
Limonite Nodules / Goethite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Blue Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Red Coral
Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.
Organic Gemstone (not a rock or mineral in the traditional sense, but bio-mineralized material)
Tumbled brecciated jasper
Microcrystalline quartz (SiO₂), with iron-oxide staining and darker volcanic/mineral fragments
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Serpentinite (serpentine-rich rock)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, brucite, and talc
metamorphic
Dalmatian Stone
Peralkaline Feldsphathic Igneous Rock
igneous
Polished serpentine (likely green serpentinite)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with magnetite and possible chromite or carbonate inclusions
metamorphic
Fluorite
Calcium Fluoride (CaF2)
mineral
Rough Rose Quartz
Quartz (Silica - SiO2)
mineral
Banded Agate (specifically Moss or River Agate variety)
Cryptocrystalline Quartz (SiO2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Blue Aventurine
Quartz (Silicon Dioxide, SiO2) with inclusions
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper
Dalmatian Stone (not a true Jasper, primarily a Perthitic Feldspar with Arfvedsonite)
igneous
Black Onyx
Silicon dioxide (SiO2) - Chalcedony variety
mineral
Dyed Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Tumbled metamorphic pebble, likely gneiss
Foliated gneiss; commonly quartz, feldspar, mica, and amphibole
metamorphic
Tree Agate
Silicon Dioxide (SiO2) - Dendritic Agate/Chalcedony
sedimentary
Fuchsite (Green Muscovite)
K(Al,Cr)2(AlSi3O10)(OH)2
Mineral
Coquina
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Banded Agate (specifically Botryoidal/Orbicular Agate)
Silicon Dioxide (SiO2)
Mineral (variety of Chalcedony/Quartz)
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral