Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
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Pyrite
Iron Disulfide (FeS2)
mineral
Chalcedony (Milky Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite-rich Ore
Pyrite (FeS2) with secondary minerals
mineral
Pyrite (Iron Pyrites)
Iron Sulfide (FeS2)
mineral
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Goethite/Hematite Nodule
Goethite (FeO(OH)) and Hematite (Fe2O3)
mineral
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class) - likely replaced by Calcite or Quartz
sedimentary
Flint (Chert Flake / Drill Tool)
SiO2 (Microcrystalline Quartz)
sedimentary
Ironstone (iron-oxide-rich rock)
Ironstone, composed mainly of hematite (Fe₂O₃) and/or goethite (FeO(OH)); exact minerals cannot be confirmed visually
sedimentary
Fossilized Shark Tooth
Selachimorpha fossil
fossil
Chert / Chalcedony Blend
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Chalcedony
Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Polished banded stone, likely zebra jasper
Zebra jasper (banded microcrystalline quartz, chiefly SiO₂, with iron-oxide and carbonate impurities)
metamorphic
Yellow Quartz
SiO2
mineral
K-Feldspar (Potassium Feldspar)
Orthoclase / Microcline (KAlSi3O8)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).
Galena (PbS)
mineral
Fossilized Shark Tooth
Elasmobranchii (Class) fossil
fossil
Pyrite with Galena and Sphalerite on Matrix
Iron Sulfide (FeS2), Lead Sulfide (PbS), Zinc Sulfide (ZnS)
mineral
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Likely pale-green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Chert (Nodular)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert Nodules
Microcrystalline Quartz (SiO2)
sedimentary
Polished ocean jasper (orbicular jasper)
Silicified volcanic rock; chiefly microcrystalline quartz/chalcedony (SiO₂), with iron oxides and other alteration minerals
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Agated Chert
Microcrystalline Quartz (SiO2)
sedimentary
Gneissic River Cobble
Gneiss
metamorphic
Pyrite
Iron Disulfide (FeS2)
Mineral
Tumbled brown stone, likely brown jasper or iron-rich chert
Microcrystalline quartz (SiO₂), possibly hematite/goethite-bearing
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Fossil Shell
Phylum Mollusca (Gastropod fossil)
fossil
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Small shell fragment (likely gastropod or bivalve fossil)
Fossilized calcium-carbonate shell; chiefly aragonite or calcite (CaCO₃)
fossil
Bivalve Fossil
Bivalvia (Phylum Mollusca)
Fossil
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled jasper
Microcrystalline quartz (SiO₂), commonly iron-oxide-bearing chalcedony
mineral
Banded Flint (Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Silicon dioxide (SiO2)
sedimentary