Amethyst (as part of a multi-stone bracelet)
Silicon Dioxide (SiO2) with iron impurities
mineral
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Greenstone / Greenschist
Greenschist (containing Chlorite, Epidote, Actinolite)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Chondrite Meteorite
Ordinary Chondrite (L or H group classification)
igneous
Red Jasper (Poppy Jasper variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Meteorite (Chondrite)
Chondritic Meteorite (Undifferentiated extraterrestrial rock)
igneous
Red Jasper (River-worn Pebble)
Silicon Dioxide (SiO2) with Ferric Iron inclusions
sedimentary (microcrystalline silicate)
Schist
Mica Schist
metamorphic
Pink Granite
Phaneritic plutonic igneous rock (Alkali-feldspar granite)
igneous
Amethyst Quartz (Tumbled)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Unakite
Unakite (Altered Granite consisting of Orthoclase KAlSi3O8, Epidote Ca2(Al,Fe)3(SiO4)3(OH), and Quartz SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Muscovite Schist
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Carnelian (Red Agate)
Silicon Dioxide (SiO2)
mineral
Amethyst Geode
Amethyst (Silicon Dioxide, SiO2)
mineral
Snowflake Obsidian
Spherulitic Obsidian (Amorphous Volcanic Glass with Cristobalite inclusions)
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Conglomerate
Conglomerate (Detrital Sedimentary Rock)
sedimentary
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Greenschist
Chlorite-actinolite schist
metamorphic
Schorl (Black Tourmaline)
Sodium iron aluminum borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Lapis Lazuli
Lazurite (primary mineral component), (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
metamorphic
Unakite
Epidotized Granite
metamorphic
Unakite (or Epidotized Granite)
Epidotized Granite (Composition: KAlSi3O8, Ca2(Al,Fe)3(SiO4)3(OH), SiO2)
metamorphic
Granite Gneiss
High-grade regional metamorphic rock (Quartz-Feldspar Gneiss)
metamorphic
Red Sandstone
Arenite (composed primarily of SiO2 with Fe2O3 cementation)
sedimentary
Basalt
Mafic volcanic rock (formula varies by mineral content: Ca-plagioclase, Pyroxene, Olivine)
igneous
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite Pebble
Quartzite (predominantly Silicon Dioxide - SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide with iron inclusions (SiO2)
sedimentary
Granite Water-Worn Pebble
Felsic intrusive igneous rock (Granite)
igneous
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Jasper (Red/Brown Variety)
Jasper (Silicon Dioxide, SiO2 plus Iron Oxide impurities)
sedimentary
Yellow Jasper
Silicon dioxide with iron inclusions (SiO2)
mineral
Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral