K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
igneous
Category
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Yellow Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Banded Agate (River-worn Pebble)
Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Green Tourmaline
Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)
mineral
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Travertine
Travertine (a terrestrial form of Limestone, CaCO3)
sedimentary
Green Quartz (Prasiolite/Adventurine/Jasper)
Silicon Dioxide (SiO2)
mineral
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Green Moss Agate
Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite
mineral
Labradorite
Plagioclase Feldspar ((Ca, Na)(Al, Si)4O8)
mineral
Feldspar-rich Pegmatite
Granitic Pegmatite (principally KAlSi3O8)
igneous
Carnelian (Carnelian Agate)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO₂)
Mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Carnelian
Chalcedony (Silicon Dioxide / SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Carnelian
Carnelian (Microcrystalline Quartz, SiO2)
mineral
Iron Meteorite
Siderite (Iron-Nickel Alloy)
meteorite
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossilized Horn Coral
Order Rugosa (Rugose Coral)
sedimentary
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Muscovite Schist with Quartz
Muscovite (KAl2(AlSi3O10)(OH)2) in Quartz Matrix
metamorphic
Quartz (Milky/Clear)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Greenstone / Nephrite Jade
Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Serpentinite
Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
metamorphic
Copper Ore (with Azurite and Malachite)
Cuprite, Azurite (Cu3(CO3)2(OH)2), Malachite (Cu2(CO3)(OH)2)
mineral
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4
metamorphic
Basalt
Extrusive Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
igneous
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Scoria (Lava Rock)
Scoria (highly vesicular extrusive igneous rock)
igneous
Chert (Flint variety)
Chert (SiO2)
sedimentary
Ironstone (likely Ferruginous Siltstone/Sandstone)
Ferruginous sedimentary rock (FeOx-rich clastic)
sedimentary
Limestone (Travertine/Tufa variant)
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone
Arenite with Hematite/Goethite cement
sedimentary
Fluorite
Calcium fluoride (CaF2)
mineral