Quartz (specifically Milky Quartz or Quartzite)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Serpentine (Serpentinite)
Serpentinite (complex silicate group including lizardite, chrysotile, and antigorite)
metamorphic
Porcelain Tile (Sandstone-look)
Man-made Ceramic (resembling Quartz-rich Sandstone)
sedimentary (imitation)
Greenschist (Greenstone)
Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)
metamorphic
Ironstone Concretion (Limonite/Goethite)
Iron oxide concretion (contains FeO(OH)·nH2O)
sedimentary
Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Corundum (Sapphire variant)
Aluminium oxide (Al2O3)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Greenschist with Quartz Veining
Greenschist (commonly containing Chlorite, Actinolite, and Epidote)
metamorphic
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium
mineral
Corundum (Sapphire/Ruby in Matrix)
Aluminium oxide (Al2O3)
mineral
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Limonite (Iron Ore/Hydrated Iron Oxide)
Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))
Mineral
Anthracite Coal
Anthracite
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Siltstone
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Ironstone Concretion (Siderite Nodules)
Siderite (FeCO3) in Mudstone or Sandstone matrix
sedimentary
Siltstone
Siltstone
sedimentary
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
sedimentary
Lavender Jade and Snowy Quartz (Druzy)
NaAlSi2O6 (Jadeite) / SiO2 (Quartz)
metamorphic
Iolite (Cordierite)
Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18
mineral
Serpentinite
Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)
metamorphic
Prehnite
Prehnite Ca2Al2Si3O10(OH)2
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Serpentinite
Serpentinite (composed mainly of Group: Serpentine; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Limonite and Goethite encrusted Chert/Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)
sedimentary