Green Aventurine
Aventurine (a variety of Quartz, SiO2)
mineral
Category
Metamorphic (Low Grade)
Browse metamorphic (low grade) specimens identified by the Rock Identifier community.
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Shungite
Non-crystalline carbon (high-carbon metamorphic rock)
metamorphic
Serpentine
Serpentine Group Minerals (e.g., Antigorite, Chrysotile, Lizardite)
Mineral, often found as a rock
Schist
Schist (metamorphic rock)
metamorphic
Aragonite (Flos Ferri)
Calcium Carbonate (CaCO3)
mineral
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Serpentine
Antigorite, Lizardite, or Chrysotile; Mg3Si2O5(OH)4
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Limonite after Marcasite (Propeller Conchoid)
Goethite/Limonite pseudomorph after Marcasite (FeO(OH)·nH2O)
mineral
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Limonite Pseudomorph after Pyrite
Limonite (FeO(OH)·nH2O) replacing Pyrite (FeS2)
mineral
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Ironstone Concretion
Ferruginous Sandstone / Siderite Concretion
sedimentary
Ironstone Concretion
Ironstone (Siderite/Limonite/Goethite)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion (Limonite/Goethite)
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Limonite stained Sandstone
Sedimentary rock with Goethite/Limonite (FeO(OH)·nH2O)
sedimentary
Limonite Concretion
Limonite (FeO(OH)·nH2O)
sedimentary
Vesicular Basalt with Opal or Quartz
Vesicular Basalt (Amorphous SiO2.nH2O if Opal)
igneous
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Ironstone Concretion / Limonite Specimen
Goethite and Limonite (Hydrous Iron Oxides)
sedimentary
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Siltstone with Iron Staining
Siltstone
sedimentary
Limonite (Iron Ore/Hydrated Iron Oxide)
Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))
Mineral
Jasper with Epidote
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Schist
Mica Schist
metamorphic
Basalt with Epidote/Chlorite
Amygdaloidal Basalt (SiO2 with (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)))
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Serpentine (Serpentinite)
Serpentinite (complex of minerals including Antigorite, Lizardite, and Chrysotile); (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Schist
Mica Schist
metamorphic
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Chrome Diopside
Magnesium Calcium Silicate (MgCaSi2O6) containing Chromium impurities
mineral
Anthracite Coal
Anthracite (Carbon based)
metamorphic