Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))
metamorphic
Category
Sedimentary Or Metamorphic Derived
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Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Tumbled quartz-rich pebble, possibly quartzite
Quartzite (mostly SiO₂), or quartz-bearing chert; exact identification requires testing
metamorphic
Likely dark green-black tumbled stone (possibly serpentine)
Unconfirmed; appearance is consistent with serpentine, a group of hydrated magnesium silicate minerals
metamorphic
K2 Stone
Azurite in Granite
igneous
Mica Schist
Schist (Muscovite/Biotite Schist)
metamorphic
Schist
Lepidoblastic Mica Schist
metamorphic
Green Aventurine
Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Almandine Garnet
Almandine - Fe3Al2(SiO4)3
mineral
Polished fossil-bearing limestone pebble
Bioclastic limestone, chiefly calcite (CaCO₃), possibly containing a small shell or coral fragment
sedimentary
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Unakite
Unakite (metamorphosed granite)
metamorphic
Unakite
Unakite (Epidotized Granite)
metamorphic
Unakite
Epidotized Granite
metamorphic
Rounded granitic gneiss cobble
Foliated granitoid gneiss, chiefly quartz, feldspar, and mica
metamorphic
Unakite
Granitic rock composed of pink orthoclase feldspar, green epidote, and clear quartz
metamorphic
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
metamorphic
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Small metallic-gold mineral fragment, possibly pyrite
Pyrite (FeS₂), if confirmed
mineral
Carved red coral bead (likely coral or coral-colored resin)
Corallium spp. (precious coral; calcium carbonate, CaCO₃)
gemstone
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Quartz (Druzy) on Matrix
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Slate
Slate; predominantly fine-grained mica- and clay-mineral rock, commonly derived from shale
metamorphic
Quartz Geode
Quartz (Silicon Dioxide, SiO2) in a Geode
sedimentary
Jasper (specifically Yellow Jasper and Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper
Jasper (variety of Chert) - SiO2
sedimentary
Jasper with Iron Staining
Silicon Dioxide (SiO2) with Ferric Oxide inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite/Limonite)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with goethite or limonite inclusions
sedimentary
Carnelian (Agate)
SiO2 (Silicon Dioxide with Iron Oxide impurities)
mineral
Likely greenstone (serpentinized ultramafic rock)
Serpentinite, dominated by serpentine-group minerals (chrysotile/lizardite/antigorite), possibly with chlorite or epidote
metamorphic
Milky quartz pebble
Quartz (SiO₂), likely massive or microcrystalline quartz
mineral
Metallic sulfide mineral fragment, likely galena
Galena (lead sulfide, PbS), tentative identification
mineral