Limonite / Iron Oxide Concretion
Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O
mineral
Category
Mineral (Specifically, A Variety Of The Mineral Species Pyrope Almandine Garnet)
Browse mineral (specifically, a variety of the mineral species pyrope almandine garnet) specimens identified by the Rock Identifier community.
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Schist
Mica Schist
metamorphic
Limonite
FeO(OH)·nH2O
mineral
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Citrine Quartz
Macrocrystalline Quartz (SiO2)
mineral
Mixed polished rock/mineral specimens
Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist
mineral
Gneiss with Quartz Veining
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Sandstone Concretion
Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite Geode / Ironstone Nodule
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Jadeite (Jade)
Jadeite (NaAlSi2O6)
metamorphic
Limonite and Goethite on Gossan
FeO(OH)·nH2O
mineral
Amethyst (Chevron Amethyst)
Amethystine Quartz (SiO2)
mineral
Banded Agate
Agate (chalcedony variety of Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Rose Quartz
Silicon dioxide with traces of titanium, iron, or manganese (SiO2)
mineral
Green Sandstone (Glauconitic Sandstone)
Glauconitic Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
sedimentary
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Greenstone / Serpentinite
Serpentinite (composed primarily of serpentine minerals: Mg3Si2O5(OH)4)
metamorphic
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
igneous
Polished Mexican “Crazy Lace” agate tower
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) - Variety of Chalcedony/Quartz
mineral
Orange Quartzite / Carnelian Agate
Silicon Dioxide (SiO2)
metamorphic
Serpentinite
Serpentinite (Hydrated magnesium iron silicate)
metamorphic
Gneiss (foliated metamorphic rock)
Gneiss
metamorphic
Pink Granite
Granite (Phaneritic igneous rock rich in Alkali Feldspar and Quartz)
igneous
Orange Calcite (Iron-Stained)
Calcium Carbonate (CaCO3)
mineral
Moonstone (Feldspar variety)
Orthoclase Feldspar (KAlSi3O8)
mineral
Dendritic Agate or Moss Agate Nodules (Septarian-like)
Chalcedony with mineral inclusions (SiO2)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineralological
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Dragon Blood Jasper
Epidote with Red Jasper (Quartz variety)
sedimentary