Serpentinite
Serpentine group minerals ((Mg, Fe)3Si2O5(OH)4)
metamorphic
Category
Metamorphic (Low Grade)
Browse metamorphic (low grade) specimens identified by the Rock Identifier community.
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Greenstone / Basalt
Aphanitic Mafic Igneous Rock (likely altered Basalt)
igneous
Jasper (Red/Brown Variety)
Jasper (Microcrystalline Quartz, SiO2)
sedimentary
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
igneous
Basalt (with possible Serpentinization)
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Red Jasper (Chert)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone (likely Quartzite-grade)
Arenite (primarily SiO2)
sedimentary
Alexandrite in Matrix
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Gossan
Iron-rich regolith (mainly Limonite and Goethite, FeO(OH)·nH2O)
sedimentary
Siltstone
Siltstone (composed of clastic quartz and feldspar)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone / Ironstone (FeO(OH)·nH2O)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sunstone
Oligoclase or Andesine (Plagioclase Feldspar) - (Ca, Na)((Al, Si)2Si2O8)
mineral
Ironstone Concretion
Siderite or Limonite Concretion
sedimentary
Ferruginous Sandstone (Gozzan)
Iron-rich clastic sedimentary rock with Limonite/Goethite
sedimentary
Limonite/Goethite Nodule
Iron Oxyhydroxide (primarily FeO(OH)·nH2O)
mineral
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Ferruginous Quartz (River Pebble)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary (secondary classification for a weathered mineral specimen)
Limonite/Goethite Concretion
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Limonite Concretion
Goethite-Limonite (FeO(OH)·nH2O)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)
sedimentary
Ferruginous Sandstone (Ironstone)
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone (with Laterite)
Ferruginous Arenite (FeO(OH)·nH2O)
sedimentary
Ironstone (possibly Bog Iron or Limonite)
Goethite-rich Ironstone (FeO(OH))
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Citrine (Heat-treated Amethyst)
Citrine Quartz (SiO2)
Mineral (Tectosilicate)
Limonite (Iron Stone Concretion)
Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O
mineral
Ferruginous Sandstone
Arenite with Hematite/Goethite cement
sedimentary
Chert
Silicon dioxide (SiO2) - Microcrystalline quartz
Sedimentary
Limonite (Ironstone)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
mineral
Limonite (Iron Stone/Gossen)
Limonite (FeO(OH)·nH2O)
mineral
Glauconitic Sandstone
Glauconitic sandstone ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Arenite with Iron-Oxide cement (Fe2O3 · nH2O)
sedimentary
Arid Sandy Loam
Arenosols / Regosols
sedimentary
Ironstone Concretion / Limonite
Goethite and Limonite (FeO(OH)·nH2O)
sedimentary
Limonite and Goethite encrusted Chert/Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)
sedimentary
Ironstone with Limonite/Goethite coating
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O)
sedimentary