Rock Identifier

Category

Mineral (Man Modified)

Browse mineral (man modified) specimens identified by the Rock Identifier community.

Learn about Mineral (Man Modified) in the encyclopedia

Pyrolusite

Celsian

Dendritic Jasper

Banalsite

Paracelsian

Feldspar

Jade

Serpentinite

Landscape Opal

Dendritic Opal

Calc-schist

Galena

Hematite (Hematite (Fe2O3)) — mineral

Hematite

Hematite (Fe2O3)

Jasper (specifically Polychrome or Desert Jasper) (Silicon Dioxide with impurities (SiO2)) — Mineral

Jasper (specifically Polychrome or Desert Jasper)

Silicon Dioxide with impurities (SiO2)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Black-and-white jasper (Jasper, microcrystalline quartz (SiO₂), with contrasting white mineral inclusions) — metamorphic

Black-and-white jasper

Jasper, microcrystalline quartz (SiO₂), with contrasting white mineral inclusions

Mahogany Obsidian (Obsidian with Hematite inclusions (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Obsidian with Hematite inclusions (SiO2 + Fe2O3)

Chert (Holey Stone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Holey Stone)

Microcrystalline Quartz (SiO2)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Limonite/Ironstone (Limonite (Hydrous ferric oxides), FeO(OH)·nH2O) — sedimentary

Limonite/Ironstone

Limonite (Hydrous ferric oxides), FeO(OH)·nH2O

Banded gneiss pebble (Gneiss, commonly quartz–feldspar–mica gneiss) — metamorphic

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss

Rhodonite (Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix) — mineral

Rhodonite

Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix

Quartz (or Chalcedony) Specimen (Silicon Dioxide (SiO2)) — mineral

Quartz (or Chalcedony) Specimen

Silicon Dioxide (SiO2)

Fluorite (Calcium fluoride (CaF2)) — mineral

Fluorite

Calcium fluoride (CaF2)

Tumbled quartz-rich stone, likely milky quartz (Quartz (SiO₂), possibly iron-stained milky quartz or quartzite) — mineral

Tumbled quartz-rich stone, likely milky quartz

Quartz (SiO₂), possibly iron-stained milky quartz or quartzite

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Moss Agate (Silicon Dioxide (SiO2) with mineral inclusions) — Mineral

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions

Quartz Crystal Point (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Point

Silicon Dioxide (SiO2)

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

Quartz (Citrine or Iron-Stained variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Feldspar (specifically Orthoclase) (Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Feldspar (specifically Orthoclase)

Potassium Aluminum Silicate (KAlSi3O8)

Tumbled serpentine (likely) (Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄) — metamorphic

Tumbled serpentine (likely)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Fluorite (Fluorite (Calcium Fluoride, CaF2)) — mineral

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Quartz Geode (Silicon Dioxide (SiO2) in a concretion) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in a concretion

Petrified Wood (Silicified Wood (SiO2)) — mineral

Petrified Wood

Silicified Wood (SiO2)

Banded Agate (Agate (Silicon Dioxide, SiO2)) — mineral

Banded Agate

Agate (Silicon Dioxide, SiO2)

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

Limonite (Hydrous ferric oxides (FeO(OH)·nH2O)) — sedimentary

Limonite

Hydrous ferric oxides (FeO(OH)·nH2O)

Tumbled ocean jasper (orbicular/chalcedony-rich jasper) (Microcrystalline quartz, SiO₂, with iron oxides and variable volcanic inclusions) — mineral

Tumbled ocean jasper (orbicular/chalcedony-rich jasper)

Microcrystalline quartz, SiO₂, with iron oxides and variable volcanic inclusions

Polished red jasper (Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides) — mineral

Polished red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides

Fluorite (Calcium Fluoride (CaF2)) — mineral

Fluorite

Calcium Fluoride (CaF2)

Limonitic ironstone / weathered iron-rich rock (Goethite–limonite aggregate; principally FeO(OH)·nH₂O with possible hematite (Fe₂O₃)) — mineral

Limonitic ironstone / weathered iron-rich rock

Goethite–limonite aggregate; principally FeO(OH)·nH₂O with possible hematite (Fe₂O₃)

Porphyritic basalt (likely amygdaloidal basalt) (Basalt, a mafic volcanic rock; composition typically plagioclase + pyroxene, with possible olivine and vesicle-filling minerals) — igneous

Porphyritic basalt (likely amygdaloidal basalt)

Basalt, a mafic volcanic rock; composition typically plagioclase + pyroxene, with possible olivine and vesicle-filling minerals

Green Fluorite (Calcium Fluoride (CaF2)) — mineral

Green Fluorite

Calcium Fluoride (CaF2)

White Marble (Recrystallized Calcite (CaCO3)) — metamorphic

White Marble

Recrystallized Calcite (CaCO3)

Clear quartz crystal (Quartz (silicon dioxide, SiO₂)) — mineral

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Polished/tumbled jasper (Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities) — mineral

Polished/tumbled jasper

Jasper, microcrystalline quartz (SiO₂) with iron-oxide and other mineral impurities

Hag Stone (Calcareous sedimentary rock (often Chert, Flint, or Limestone)) — sedimentary

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

Chert (Jasper/Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Limonite (Iron Ore) (FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)) — mineral

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)

Quartz geode (Quartz (SiO₂), likely drusy/microcrystalline quartz lining a geode cavity) — mineral

Quartz geode

Quartz (SiO₂), likely drusy/microcrystalline quartz lining a geode cavity

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky/Sugar variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Sugar variety)

Silicon Dioxide (SiO2)