Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Category
Anthropogenic (Man Made Industrial Byproduct)
Browse anthropogenic (man made industrial byproduct) specimens identified by the Rock Identifier community.
Learn about Anthropogenic (Man Made Industrial Byproduct) in the encyclopedia
View all →
Pink Marble
Recrystallized Limestone (Calcium Carbonate, CaCO3)
metamorphic
Tree Agate
Chalcedony (SiO2)
gemstone
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Quartzite
Silica (SiO2) quartzite
metamorphic
Sandstone
Arenite
sedimentary
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Likely blue glass or synthetic gemstone jewelry
Uncertain; possibly synthetic spinel, cubic zirconia, or blue glass
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Quartz (in matrix)
Quartz (SiO₂)
mineral
Raw calcite specimen
Calcite, calcium carbonate (CaCO₃)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Polished greenstone pebble
Likely nephrite jade (tremolite–actinolite), though serpentine or greenstone is possible from appearance alone
metamorphic
Diamond
C (Carbon)
gemstone
Fluorite (likely)
Calcium Fluoride (CaF2)
Mineral
Chert (specifically White Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Flint
Silicon dioxide (SiO2)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Pallasite Meteorite
Pallasite (Stony-Iron Meteorite)
meteorite
Pearl (with Peridot)
Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Bismuth
Bismuth (Bi)
Mineral
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Chert (Chocolate or Brown Flint)
Chert (SiO2)
sedimentary
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Yellow Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Chert (Flint/Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Greenstone / serpentinite carving
Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile); exact identification requires testing
metamorphic
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Iron-stained quartz-rich breccia (probable)
Hydrothermal quartz–iron oxide breccia; mainly SiO₂ quartz with iron oxides/hydroxides (hematite/goethite)
igneous
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Pyrite
Pyrite (Iron sulfide, FeS₂)
mineral