Polished orange agate/jasper cabochon
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration; exact variety uncertain
mineral
Category
Man Made Material (Jewelry, Metal Alloy)
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Rose quartz
Quartz (silicon dioxide, SiO₂), pink variety
mineral
Tumbled purple agate (likely grape agate or amethystine chalcedony)
Microcrystalline quartz, SiO₂; purple coloration commonly from iron, manganese, or inclusions
mineral
Iolite
Cordierite (Mg2Al3(AlSi5O18))
gemstone
Dumortierite Quartz
Dumortierite in Quartz (Al6O3(BO3)(SiO4)3)
mineral
Amazonite in Quartz
K(AlSi3O8) - Potassium Feldspar with Quartz (SiO2)
mineral
Unakite
Altered Granite (Unakite)
metamorphic
Chalcedony Pebble / Rough Agate
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Red Quartzite Pebble
Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Amber
Succinite (C10H16O)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Septarian Nodule
Septarian Concretion (Calcium Carbonate/Aragonite/Calcite/Siderite)
sedimentary
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Polychrome Jasper (Desert Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Amethyst
Amethyst (Silica mineral, SiO2)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Amethyst Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Dark mafic igneous rock, likely basalt or gabbro
Basalt–gabbroic rock; chiefly plagioclase feldspar and pyroxene, possibly olivine
igneous
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Blue-dyed howlite beads (likely)
Howlite, Ca₂B₅SiO₉(OH)₅, commonly dyed blue to imitate turquoise
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
C (Carbon)
gemstone
Tumbled green aventurine (probable)
Quartz, SiO₂, with fuchsite mica inclusions
mineral
Fossil Coral
Rugose Coral / Hexagonaria (CaCO3)
fossil
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Porphyritic Basalt (or Porfido / Porphyry Beach Pebble)
Porphyritic Basalt / Andesite
igneous
Gravel/Common Siltstone
Siltstone (fine-grained siliciclastic sedimentary rock)
sedimentary
Amazonite
Microcline (KAlSi3O8)
mineral
Quartzite (Ferruginous Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral