Crazy Lace Agate
Chalcedony (SiO2) with microcrystalline quartz
sedimentary
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
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Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Chalcedony (likely Carnelian or Yellow Agate)
Silicon Dioxide (SiO2)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
Mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Beryl (Emerald variety in host rock)
Be3Al2(SiO3)6 (Silicate mineral)
mineral
Mica Schist
Mica Schist (varies based on mineral makeup, often Biotite/Muscovite schist)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Chalcopyrite
CuFeS2 (Copper Iron Sulfide)
mineral
Gneiss
High-grade regional metamorphic rock
metamorphic
Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Pyrite in Matrix (likely Quartz or Coal)
Iron Sulfide (FeS2)
mineral
Chert (Yellow/Tan Variety)
Chert (SiO2)
sedimentary
Shale or Argillite
Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)
Sedimentary or Metamorphic (low grade)
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Amber (Dark/Black Variety)
Succinite (Resinite), C10H16O
mineral
Banded Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Amber
Succinite (fossilized resin)
Organic Mineraloid
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Jasper containing Agate (Jaspagate)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Fossilized Bone
Permineralized Vertebrate Fossil
sedimentary
Green Gneiss or Greenschist
Chlorite/Actinolite Gneiss or Schist
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Blue-green tourmaline (likely indicolite)
Elbaite tourmaline, Na(Li1.5Al1.5)Al6(BO3)3Si6O18(OH)4
gemstone
Quartz (Rose Quartz or Jasper variety)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2) with hematite impurities
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chrysocolla Chalcedony
Hydrated Copper Phyllosilicate (Cu,Al)2H2Si2O5(OH)4 + SiO2
mineral
Brecciated Chert
Silicon Dioxide (SiO2)
sedimentary
Sandstone with Desert Varnish
Arenite (SiO2 predominantly) with Ferromanganese coating
sedimentary
Moss Agate and Hematite
Silica (SiO2) with fibrous inclusions of Manganese or Iron; Hematite (Fe2O3)
mineral
Fossilized Shell in Limestone
Carbonate sedimentary rock with Bivalvia or Brachiopoda remains
fossil
Green Moonstone (Garnierite)
Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)
mineral
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil