Fluorite
Calcium Fluoride (CaF2)
mineral
Category
Sedimentary (With Some Aspects Of Mineral Replacement)
Browse sedimentary (with some aspects of mineral replacement) specimens identified by the Rock Identifier community.
Learn about Sedimentary (With Some Aspects Of Mineral Replacement) in the encyclopedia
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Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Columnar Calcite / Satin Spar
Calcite (Calcium Carbonate, CaCO3)
mineral
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Chert (Jasper/Chalcedony variety)
Silicon Dioxide (SiO2)
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Yellow Jade (often Serpentine or Dolomite)
Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.
Mineral, often a rock given its aggregate nature
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granitic Gneiss
Gneiss (containing Potassium Feldspar and Quartz)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Chert (variant Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz-Veined Sandstone
Quartz-veined Arenite
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Red Jasper (Skull Carving)
Jasper, a cryptocrystalline variety of Quartz (SiO2)
sedimentary
Pearl
Calcium Carbonate (CaCO3) with Conchiolin
mineral
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Ironstone Concretion (Coprolite-like)
Goethite/Hematite Siderite Spheroid (FeCO3 or FeO(OH))
sedimentary
Weathered iron-rich rock, likely laterite or ironstone
Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals
sedimentary
Chert (Flint variety)
Chert (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Ammonite Fossil
Ammonitida (Extinct subclass of Cephalopoda)
sedimentary
Banded Gneiss
Gneiss
metamorphic
Agate
Agate (Silicon Dioxide - SiO2)
mineral
Green Gneiss
Metamorphic Gneiss
metamorphic
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Yellow Jasper
Silicon Dioxide with Limonite/Goethite inclusions (SiO2)
sedimentary
Fossilized Oyster Shell
Gryphaea or Exogyra (Family Ostreidae)
fossil
Limonite Geode (Ironstone Concretion)
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Gneiss (with Quartzite and Biotite)
Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)
metamorphic
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Jasper Agate
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Fossil-bearing sedimentary rock, possibly fossil wood or bone
Indeterminate silicified/carbonate fossil in sandstone or mudstone
fossil
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Gneiss (Granulite / Foliated Metamorphic Rock)
Gneiss
metamorphic
Flint
SiO2 (Microcrystalline Quartz)
sedimentary