Chert Pebble with Inclusion
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral And Organic Gemstone
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Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone with Hematite and Iron)
sedimentary
Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Jasper-like Silicate)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Mixed Quartz and Jasper Pebbles
Silicon Dioxide (SiO2)
Mineral
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Gravel variety)
Silicon Dioxide (SiO2)
mineral
Geode (Calcite or Quartz)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Fire Opal
Hydrated Silica (SiO2·nH2O)
mineral
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Fossiliferous Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Mineraloid
Taaffeite
BeMgAl4O8 (Beryllium Magnesium Aluminum Oxide)
mineral
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Chert (Jasper variation)
Chert (Cryptocrystalline microcrystalline Silicon Dioxide, SiO2)
sedimentary
Moonstone (Feldspar)
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Chert (Flint variety)
Chert (SiO2)
sedimentary
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone Concretion with Fossil Wood
Ferruginous Sandstone Concretion (SiO2 with Fe2O3 cement)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint variety)
Microcrystalline context of Quartz (SiO2)
sedimentary
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Chert (Jasper/Flint Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Pyrite in Limestone
Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)
mineral
Yellow Jasper
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal or Tumbled)
Chalcedony (SiO₂)
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Banded Chert (or River Jasper)
Microcrystalline Quartz (SiO2) with iron oxide impurities
sedimentary
Granite Pebble (Salt and Pepper Granite)
Felsic Intrusive Igneous Rock (Granite)
igneous
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Kunzite
Spodumene (LiAlSi2O6)
mineral
Epidote with Magnetite/Hematite inclusions
Epidote (Ca2(Al2,Fe3+)(SiO4)3(OH)) with Iron Oxides
mineral