Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Category
Mineral (Pseudomorph)
Browse mineral (pseudomorph) specimens identified by the Rock Identifier community.
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Limonite (Iron Ore)
Limonite (Hydrous iron(III) oxide-hydroxide mixture, FeO(OH)·nH2O)
mineral
Sardonyx Agate Sphere
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
mineral
Turquoise (set in silver jewelry)
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Turquoise
Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O
mineral
Schist
Schist (Foliated Metamorphic Rock)
metamorphic
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Emerald (or possibly Green Glass / Slag)
Beryl (Be3Al2(SiO3)6)
gemstone
Limonite with Opal infusion
FeO(OH)·nH2O (Limonite) / SiO2·nH2O (Opal)
mineral
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Note: No specimen visible
N/A
Jade (likely Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral/Mineraloid
Fossilized Bone Fragment
Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)
sedimentary
Basalt with Epidote (Greenstone)
Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)
igneous
Fluorite
Calcium Fluoride (CaF2)
mineral
Apatite
Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))
mineral
Granodiorite
Granodiorite
igneous
Gneiss (specifically a granitic gneiss cobble)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')
Silicon Dioxide (SiO2) with artificial pigment
mineral
Sandstone Concretion with Quartz Center
Sedimentary Clastic Rock (SiO2 matrix with Quartz core)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Kidney Stone (Urolith)
Calculus renalis (Biogenic mineral aggregate)
mineral
Petrified Coral Fossil (Honeycomb Coral)
Favosites (Rugosa/Tabulate coral fossil replaced by microcrystalline quartz/chalcedony)
fossil
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Satin Spar Selenite
Fibrous Gypsum (CaSO4·2H2O)
mineral
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Sandstone (Quartzite texture)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Dalmatian Stone
Peralkaline rhyolite
igneous
Hematite
Iron(III) oxide (Fe2O3)
mineral
Lepidolite with Quartz
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Quartz Vein / Quartzite with Iron Oxide Staining
Silicon Dioxide (SiO2)
mineral
Porphyritic Igneous Rock / Granite or Rhyolite Porphyry
Porphyritic intrusive/extrusive igneous rock
igneous
Quartz-rich pegmatite or quartz vein rock
Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining
igneous
Gneiss
Gneiss (quartz-feldspar-biotite gneiss)
metamorphic
Gneiss
Metamorphic rock of high-grade regional metamorphism
metamorphic