Ironstone Concretion / Limonite Node
Goethite / Limonite (FeO(OH)·nH2O)
sedimentary
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Conglomerate
Clastic sedimentary rock (Conglomerate)
sedimentary
Actinolite
Ca2(Mg,Fe)5Si8O22(OH)2
mineral
Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions
Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)
igneous/metamorphic
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Sandstone
Arenite (SiO2 principal)
sedimentary
Sandstone (likely Siltstone or Mudstone)
Clastic sedimentary rock (primarily SiO2 with various oxides)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Sandstone Pebble
Arenite with Hematite (Fe2O3) cement
sedimentary
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Yellow Aventurine
Quartzite with inclusions (SiO2)
metamorphic
Sandstone Cobble
Arenite (Sandstone)
sedimentary
Sandstone (likely Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone
Arenite (SiO2 with various cementation agents)
sedimentary
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Feldspar Rich Granite with Limonite Staining
K-Feldspar Granite (KAlSi3O8)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Green Moss Agate
Agate (Silicon Dioxide, SiO2) with inclusions
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Black Beach Pebble / Basalt Pebble
Basalt / Mafic Volcanic Rock
igneous
Limonite (Iron Ore)
Limonite (unstructured hydrated iron(III) oxide-hydroxides, often FeO(OH)·nH2O)
mineral
Dalmatian Jasper
Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)
igneous
Obsidian
Volcanic Glass (Silicon Dioxide with impurities)
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Quartz (Cut and Polished Sphere)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Quartz Sand
Silicon Dioxide (SiO2)
sedimentary
Cobblestones (Basalt/River Rock)
Polished lithic fragments and rounded pebbles
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Ocellar Rhyolite
Rhyolite (featuring orbicular/ocellar quartz and feldspar textures)
igneous
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Amethyst (with Pyrite and other minerals)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Citrine
Silicon Dioxide (SiO2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
metamorphic
Ironstone Nodules (Iron Concretion)
Siderite or Hematite Concretion
sedimentary