Limonite (Iron Ore / Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Category
Mineral (Synthetic)
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Weathered granite or granitic gneiss
Granite; chiefly quartz, feldspar, and mica, possibly with gneissic foliation
igneous
Limonite Concretion
Limonite (FeO(OH)·nH2O) Pseudomorph
sedimentary
Amygdaloidal Basalt with Agate/Zeolite Amygdules
Basalt (extrusive igneous rock) containing secondary mineral fillings
igneous
Yellow Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Unidentified pale stone or mineral specimen
Indeterminate; possibly massive quartz, calcite, or a light-colored feldspathic rock
mineral
Sandstone with Ironstone Concretion
Arenite with Ferruginous Cement
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Granite
Intrusive Igneous Rock
igneous
Rock Specimen
Unclassified rock specimen
sedimentary
Limonite Ironstone
Goethite-Limonite concretion / Iron oxide
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (SiO2 with accessory minerals)
sedimentary
Quartz-rich pegmatite (likely feldspar–quartz rock)
Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining
igneous
Banded Gneiss
Gneiss (typically quartz, feldspar, mica, amphibole composition)
metamorphic
Schist
Schist (various mineral compositions)
Metamorphic
Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)
Copper-bearing polymetallic mineral aggregate (Cu-minerals)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Gypsum (Selenite sand)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Fluorite on Host Rock
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Limonite
FeO(OH)·nH2O
mineral
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Pink Granite (Unakite-bearing or Epidote-bearing Granite)
Plutonic Igneous Rock (Granite)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Granite
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Gneiss
Gneiss
metamorphic
Diorite (Salt and Pepper Rock)
Diorite
igneous
Gneiss
Gneiss
metamorphic
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Basalt with Vesicular/Amygdaloidal Alteration
Extrusive Igneous Rock (Mafic)
igneous
Epidote
Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Basalt with Amygdule
Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill
igneous
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Red Sandstone (Iron-stained)
Clastic sedimentary rock (primarily Quartz with Iron Oxides)
sedimentary
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Tumbled agate/chalcedony
Microcrystalline quartz (SiO₂), likely mossy or dendritic agate with iron-oxide inclusions
mineral