Gneiss (specifically a Granitic Gneiss)
Gneiss (typically composed of Quartz, Feldspar, and Mica/Amphiboles)
metamorphic
Category
Mineral (Tectosilicate)
Browse mineral (tectosilicate) specimens identified by the Rock Identifier community.
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Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
metamorphic
Granitic Pegmatite
Pegmatite containing Quartz, Feldspar, and Muscovite mica
igneous
White Quartz with Black Tourmaline
Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Quartz (with probable host rock)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Flint or Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Olivine in Basalt (Peridotite Xenolith)
Forsterite-rich Olivine (Mg2SiO4) in Aphanitic Basalt
igneous
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Limonite-stained Quartz
Silicon Dioxide (SiO2) with Iron Oxide/Hydroxide (FeO(OH)·nH2O) staining
mineral
Banded Chert
Microcrystalline Quartz (SiO2)
sedimentary
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Limonite
Limonite (FeOO·nH2O)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Eclogite
Eclogite (Omphacite + Pyrope)
metamorphic
Gossanous Sandstone (likely Terrestrial)
Arenite with Iron-Oxide inclusions
sedimentary
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Banded Gneiss (River Cobble)
Gneiss (a high-grade metamorphic rock)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Chrysocolla on Quartz with Iron Oxides
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)
mineral
Glacial Granite with Epidote
Granite featuring Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
igneous
Amygdaloidal Basalt
Basalt with Secondary Mineral Infillings
igneous
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Basalt with Epidote (Greenstone)
Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling (SiO2/CO3)
igneous
Jade (likely Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral/Mineraloid
Hypersthene
(Mg,Fe)SiO3 - Enstatite-Ferrosilite series
mineral
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Laterite
Laterite (Ferricrete / Alcrete)
sedimentary
Note: No specimen visible
N/A
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Staurolite (Fairy Stone)
Staurolite (formula: Fe2+2Al9Si4O23(OH))
metamorphic
Okenite (in Zeolite matrix)
Okenite (CaSi2O5 · 2H2O)
mineral
Ferruginous Sandstone (Gozzanous)
SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Bauxite
Bauxite (mixture of hydrous aluminum oxides: Al(OH)3 & AlO(OH))
sedimentary