Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral (Man Made Glass)
Browse mineral (man made glass) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass) in the encyclopedia
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Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Granite
Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina
Bioclastic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Coquina
Biogenic Limestone (mostly Calcium Carbonate, CaCO3)
sedimentary
White Marble
Metamorphic Limestone (CaCO3)
metamorphic
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Basalt
Basalt
Igneous
Jade (likely Nephrite Jade based on appearance)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Diabase (Greenstone)
Diabase (Dolerite)
igneous
Lapis Lazuli
Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)
Mineral, part of a rock
Granite
Granite (felsic intrusive igneous rock)
igneous
Pallasite Meteorite
Pallasite (Stony-Iron Meteorite)
meteorite
Mother of Pearl (Nacre)
Calcium Carbonate (primarily aragonite, with conchiolin)
Organic Gemstone/Biomineral
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Green glassy slag or manufactured glass bead
Noncrystalline silicate glass; likely industrial glass/slag, not a true mineral
mineral
Mother of Pearl (Nacre) / Shell Fragment
Biogenic Calcium Carbonate (Aragonite and Conchiolin)
fossil
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Crinoid Columnal Fossil in Chert
Crinoidea stemming section in Microcrystalline Quartz (SiO2)
fossil
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Diabase (Dolerite)
Diabase or Dolerite
igneous
Chert (Yellow Jasper/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diorite
Phaneritic Intrusive Igneous Rock (composed of Plagioclase feldspar, Hornblende, and Biotite)
igneous
Chert (variations include Flint/Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Coquina and Oyster Fossil Rock
Coquina limestone (Calcium Carbonate, CaCO3) containing fossilized Crassostrea / bivalve shells
fossil
Pink Granite
Intrusive Igneous Rock (high K-feldspar content)
igneous
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Chert (Silicon Dioxide, SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Jasper Variant likely)
Silicon Dioxide (SiO2)
Sedimentary Rock or Mineral (depending on origin and purity)
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Petoskey Stone
Favosites alpenensis
fossil
Chert
Microcrystalline quartz (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)
igneous