Amazonite pendant
Amazonite, a green variety of microcline feldspar (KAlSi₃O₈)
mineral
Category
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Weathered gray metamorphic rock, likely phyllite or slate
Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite
metamorphic
Polished tiger’s-eye
Quartz variety, chiefly fibrous quartz (SiO₂), with iron-oxide inclusions
mineral
Carnelian
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Blue Apatite
Calcium phosphate mineral, Ca5(PO4)3(F,Cl,OH)
mineral
Schist
Mica Schist
metamorphic
Fossil shell/brachiopod impression
Likely a fossil brachiopod (Phylum Brachiopoda), possibly a ribbed spiriferid; exact species requires examination
fossil
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Weathered breccia or hydrothermal vein rock
Silicified polymict breccia, likely quartz–iron-oxide breccia
rock
Red Jasper
Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)
mineral
Tumbled green aventurine quartz
Quartz, silicon dioxide (SiO₂), with green fuchsite mica inclusions
mineral
Limestone (Weathered/Silicified)
Sedimentary carbonate rock (primarily CaCO3)
sedimentary
Scoria (vesicular basalt)
Scoria; iron- and magnesium-rich volcanic rock, chiefly plagioclase, pyroxene, and olivine
igneous
Tumbled epidote or epidote-rich stone
Epidote, Ca₂(Al,Fe)₃(SiO₄)₃(OH); possibly a green jasper or prehnite-epidote aggregate
mineral
Iron-stained metamorphic rock, likely schist or quartzite
Quartz–mica–iron oxide rock; probable muscovite/biotite schist or ferruginous quartzite
metamorphic
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Limonite (Ironstone)
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Limonite (Goethite/Ironstone)
Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limonite/goethite-rich ironstone
Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)
mineral
Moonstone (Variety of Orthoclase Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Siltstone
Siltstone (Siliclastic sedimentary rock)
sedimentary
Dalmatian Jasper
Dalmatian Stone (Felsite with Arfvedsonite/Tourmaline)
igneous
Black Obsidian
Volcanic glass (Amorphous silicates)
igneous
Mica Schist
Metamorphic Rock (Schistose)
metamorphic
Limonite / Ironstone Nodule
Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Quartz crystal cluster
Quartz, silicon dioxide (SiO₂); likely pale amethyst or iron-stained quartz
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst Quartz
Amethyst (SiO2 with Iron impurities)
mineral
Larimar (blue pectolite)
Pectolite, NaCa₂Si₃O₈(OH), commonly copper-bearing blue variety
mineral
Dalmatian Jasper
Peralkaline Rhyolite (composed of Quartz, Feldspar, and Arfvedsonite)
igneous
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Gold Ore in Quartz
Native Gold (Au) in Quartz (SiO2) matrix
mineral
Raw Topaz
Aluminum Silicate Fluoride Hydroxide, Al2SiO4(F,OH)2
mineral
Goniatite Fossil
Order Goniatitida
fossil
Lapis Lazuli
Lapis Lazuli (Metamorphic rock containing lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, calcite, and pyrite)
metamorphic
Opalite
Synthetic Opalized Glass
mineraloid (man-made)
Amethyst (Tumbled)
Silicon Dioxide (SiO2)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Serpentinite (serpentinized ultramafic rock), possibly with chromite
Serpentine-group minerals, chiefly lizardite and chrysotile; commonly derived from peridotite or pyroxenite, with possible chromite and magnetite
metamorphic