Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Category
Sedimentary (Chemically Precipitated Mineral)
Browse sedimentary (chemically precipitated mineral) specimens identified by the Rock Identifier community.
Learn about Sedimentary (Chemically Precipitated Mineral) in the encyclopedia
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Chert (Yellow or Tan Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Dalmatian Stone (often called Dalmatian Jasper)
Peralkaline Quartz-Feldspar Rock with Arfvedsonite (formerly believed to be Jasper)
igneous
Chert (Jasper variation)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Blue Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial pigment
mineral
Red Sandstone / Mudstone Nodules (L Liesegang rings)
Sedimentary Rock (Quartz/Hematite Clay Mix)
sedimentary
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Mineral/Semiprecious Gemstone (variety of Quartz)
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite
sedimentary
Chert/Flint Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
sedimentary
Chert (with Drusy Quartz Pocket)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Garnet in Schist/Gneiss Matrix
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
metamorphic
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO₂)
Mineral
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Tan Chert)
Chert (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Astrophyllite
Astrophyllite (K2NaFe7Ti2Si8O26(OH)4F)
mineral
Howlite (Dyed to resemble Turquoise)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Chert (or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert or Chalcedony
Microcrystalline Quartz (SiO2)
sedimentary
Dyed Purple Agate Sliced
Silicon Dioxide (SiO2) with artificial pigment
mineral
Chert (Flint)
Chert (Microcrystalline or cryptocrystalline Quartz, SiO2)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Ironstone Concretion / Goethite-Hematite Geode
Goethite / Hematite Concretion (Fe3O4 / FeO(OH) / Fe2O3)
sedimentary
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Quartz Vein in Matrix (Gneiss/Schist)
Silicon Dioxide (SiO2) in Metamorphic Rock Matrix
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral