Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Category
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Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
gemstone
Vesicular Basalt (Lava Rock)
Aphanitic Mafic Igneous Rock
igneous
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Moss Agate
Chalcedony (SiO2) with inclusions of manganese or iron oxide
mineral
Bauxite
Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)
sedimentary
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
mineral
Tumbled green aventurine (probable)
Quartzite dominated by microcrystalline quartz (SiO₂), with green fuchsite mica inclusions
mineral
Amethyst (Tumbled)
Amethyst (Silicon Dioxide with Iron impurities) - SiO2
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide with iron impurities) - SiO2
mineral
Blue Apatite
Apatite group (Ca5(PO4)3(F,Cl,OH))
mineral
Moss Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Amazonite
K(AlSi3O8) - Potassium aluminum silicate
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2 with inclusions of Manganese/Iron oxides)
mineral
Carnelian Agate Nodule
Chalcedony (SiO2) with Iron Oxide inclusions
sedimentary
Amazonite
K(AlSi3O8), Microcline
mineral
Stromatolite
Biogenic sedimentary rock
sedimentary
Basalt River Pebble
Basalt
igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Moonstone (Tumbled)
Orthoclase Feldspar (KAlSi3O8) with inclusions of Albite
mineral
Carnelian
Carnelian (SiO2 - Silicon Dioxide with Iron Oxide impurities)
mineral
Polished brown banded agate cabochon
Agate, a microcrystalline variety of silica (SiO₂), chiefly chalcedony
mineral
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Rose quartz
Quartz, SiO₂ (pink variety; trigonal crystal system)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Moss Agate
Silicon Dioxide with inclusions (SiO2)
mineral
Tree Agate
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al, Fe)3(SiO4)3(OH))
metamorphic
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Amethyst
Amethyst (SiO2 with iron impurities)
mineral
Vesicular Basalt
Extrusive Mafic Volcanic Rock
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Polished agate (likely banded chalcedony)
Microcrystalline quartz, SiO₂ (chalcedony/agate)
gemstone
Slate
Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz
metamorphic
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions
Mineral
Amethyst (Geode Fragment)
Silicon Dioxide with iron impurities (SiO2)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral