Glauconitic Sandstone
Glauconitic Quartz Arenite
sedimentary
Category
Organic (Sedimentary Associated)
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Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Petrified Wood
Silicified Wood (Quartzo-feldspathic fossil wood)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Weathered coal-bearing sedimentary rock (likely shale or mudstone with coal fragments)
Carbonaceous shale/mudstone; predominantly clay minerals, quartz, and organic carbon
sedimentary
Petrified Wood
Silicified wood / Xylopal
fossil
Petrified Wood
Silicified wood (Quartz / Chalcedonized wood, SiO2)
sedimentary
Chert (Chert Nodule with Cortex)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Red Coral
Corallium rubrum
gemstone
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Green Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2 - Silicon Dioxide/Quartz)
metamorphic
Chert (and Limestone)
Chert (consisting of Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Possible flint or black chert
Microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class) fossilized tooth
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Graphite-rich schist (likely graphite ore)
Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar
metamorphic
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert (Ironstone/Jasper)
Cryptocrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Tufa (Calcareous Tufa)
Calcareous Tufa (CaCO3)
sedimentary
Tufa (Limestone)
Calcareous Tufa (CaCO3)
sedimentary
Petrified Wood
Silicified wood (primarily quartz replacing organic cellulose)
fossil
Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Green Moss Agate
Silicon Dioxide (SiO2) with inclusions of hornblende or chlorite
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Yellow Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide (Limonite/Goethite) inclusions
sedimentary
Chert (and associated river cobbles)
Silicon dioxide (SiO2)
sedimentary
Graphite-rich metamorphic rock (likely graphite schist)
Graphite schist; predominantly graphitic carbon (C) with mica and quartz
metamorphic
Banded Chert (Flint/Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Fossilized Wood (Petrified Wood) and Associated Rocks
Silicified Wood / Xylopal
fossil
Chalcedony (Agatized Coral / Rough Chalcedony Node)
Silicon Dioxide (SiO2)
mineral
Dalmatian jasper (often sold as Dalmatian stone)
Quartz-bearing leucocratic alkali-feldspar–aegirine/arfvedsonite porphyritic rock; commercial “jasper” designation
igneous
Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Dendritic Agate
Chalcedony (SiO2) with manganese/iron oxide inclusions
mineral
Travertine (Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Chert (and Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fluorite
Fluorite (CaF2)
mineral
Banded Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary