Glauconite (Greensand)
Glauconite ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Category
Organic Gemstone (Often Associated With Sedimentary Sequences)
Browse organic gemstone (often associated with sedimentary sequences) specimens identified by the Rock Identifier community.
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Fluorite (Fluor-spar)
Calcium Fluoride (CaF2)
mineral
Fluorite (Green Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Gneiss (specifically Granitic Gneiss)
Gneissic Metamorphic Rock
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Calcareous Tufa (or Travertine)
Calcium Carbonate (CaCO3)
sedimentary
Red Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (Zebra Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Shale
Shale (fine-grained clastic sedimentary rock)
Sedimentary
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
mineral
Banded Chert
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Golden Mica Schist
Mica Schist (primarily Muscovite/Biotite with Quartz)
metamorphic
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Black Pearl (Tahitian Type)
Aragonite / Pinctada margaritifera (CaCO3 + Conchiolin)
Organic Gemstone
Malachite-bearing Rock
Cu2CO3(OH)2
mineral
Green Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Basanite variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone with Brachiopod shell
Calcium carbonate (CaCO3)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Green Fluorite
Calcium fluoride (CaF2)
mineral
Geode (Unopened)
Siliceous Septarian Concretion / Geode (SiO2)
sedimentary
Green Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Chert Nodules (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Black Jasper (Black Stone / River Pebble)
Silicon Dioxide (SiO₂), Opaque variety of Chalcedony
sedimentary
Green Agate
Silicon dioxide (SiO₂)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Chert
Silicon Dioxide (SiO2) with fossil inclusions
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Amber
Succinite (fossilized resin)
mineral
Psilomelane (Manganese Ore)
Psilomelane (Ba,H2O)2Mn5O10
mineral
Travertine
Calcareous tufa (CaCO3)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Flint
Chert (Silicon dioxide, SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
sedimentary