Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
mineral
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
Learn about Mineral Composite in the encyclopedia
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Wollastonite
Calcium Inosilicate Mineral, CaSiO3
mineral
Mica (Biotite or Phlogopite Buchsam)
Silicate Mineral (Phyllosilicate family)
mineral
Spherulitic Agate / Moss Agate
Chalcedony (SiO2) with mineral inclusions
mineral
Dendritic Agate or Moss Agate Nodules (Septarian-like)
Chalcedony with mineral inclusions (SiO2)
sedimentary
Vesicular Basalt (Amygdaloidal Basalt)
Basalt with Secondary Mineral Inclusions
igneous
Pearl
Organic Mineral (CaCO3 with conchiolin)
mineral
Chert (Jasper variation)
Chert (Silicate mineral, SiO2)
sedimentary
Banded Gneiss
Gneiss (variable mineral composition)
metamorphic
Jasper
Jasper (Silicate mineral, SiO2)
sedimentary
Aragonite
Aragonite (Carbonate mineral), CaCO3
mineral
Jasper
Jasper (Silicate mineral, SiO2)
sedimentary
Sandstone (likely Quartzose)
Arenite (SiO2 principal mineral)
sedimentary
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Carnelian
Carnelian (Silicate mineral, SiO2)
mineral
Amethyst
Amethyst (Silica mineral, SiO2)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling
igneous
Red Jasper
Jasper (Silicate Mineral - SiO2)
sedimentary
Schist
Schist (various mineral compositions)
metamorphic
Quartzite Pebble
Quartzite (SiO2) with mineral inclusions
metamorphic
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Quartz-rich pegmatitic rock, possibly rose quartz with mica
Granitic pegmatite; predominantly quartz (SiO₂), with feldspar and mica
igneous
Biotite-bearing granite
Granite, composed mainly of quartz (SiO₂), potassium feldspar, plagioclase, and biotite mica
igneous
Polished black obsidian pyramid/block
Obsidian — natural volcanic glass, chiefly rhyolitic silica (approximately 70–75% SiO₂)
igneous
Banded Gneiss
Banded Gneiss (High-grade Metamorphic Rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Limonite Concretion
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)wnH2O)
sedimentary
Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
mineral
Limonite Geode (Ironstone Concretion)
Goethite/Limonite FeO(OH)·nH2O
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Greenstone (Epidote/Chlorite Rich Rock)
Metabasalt (often contains Epidote Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz River Pebble with Algae
Silicon Dioxide (SiO2) with organic biofilm
metamorphic or igneous
Quartz (Pink/Orange Variety)
Silicon Dioxide (SiO2)
mineral
Rough Quartz (Alluvial Pebbles)
Silicon Dioxide (SiO2)
mineral
Greenstone with Epidote or Quartz veins
Metabasalt (Greenstone facies)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (specifically Green Chert/Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary