Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Gneiss (Hornblende/Biotite Gneiss)
Foliated Metamorphic Rock (Quartz-Feldspar-Amphibole/Mica matrix)
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Iron-rich concretion (probable limonite/goethite concretion)
Hydrated iron oxides, chiefly limonite (FeO(OH)·nH₂O) and goethite (FeO(OH))
sedimentary
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Botryoidal Chalcedony
Cryptocrystalline Silicon Dioxide (SiO2)
mineral
Pegmatite
Granite Pegmatite
igneous
Amber
Fossilized Tree Resin
gemstone
Quartz Geode (Cracked)
Crystalline Silicon Dioxide (SiO2)
mineral
Fossilized Coral
Cnidaria (Hexacorallia)
fossil
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Petoskey Stone
Hexagonaria percarinata
fossil
Conglomerate
Sedimentary Conglomerate with Basaltic Clast
sedimentary
Agate
Chalcedony (cryptocrystalline variety of Quartz, SiO2)
mineral
Chert (containing Flint and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Brachiopod Fossil
Phylum Brachiopoda
fossil
Gneiss (Metamorphosed Pebble)
Gneiss with Quartz/Feldspar banding
metamorphic
Celestite
Celestine (Strontium Sulfate, SrSO4)
mineral
Gneiss
Gneiss
metamorphic
Fossilized ammonite
Ammonoidea (likely a ribbed Jurassic–Cretaceous ammonite), replaced mainly by calcite or silica
fossil
Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Banded Chert (Jasper) River Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3, or Pyrite)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (containing Orbicular/Agate patterns)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Yellow Jasper / Chert
Jasper (Silica/Quartz) - SiO2
sedimentary
Oolitic Chert
Oolitic Microcrystalline Quartz (SiO2)
sedimentary
Quartz geode with iron-oxide matrix
Quartz (SiO₂), likely with limonite/goethite and possibly calcite
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Granitic Gneiss
Gneiss (Complex silicate composition)
metamorphic
Chert (Green variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary