Mixed Mineral Specimens
Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)
mineral
Category
Mineral Specimen
Browse mineral specimen specimens identified by the Rock Identifier community.
Quartz (Variety of Rough Mineral Specimens)
Silicon Dioxide (SiO2)
mineral
The user-provided image does not contain a rock or mineral specimen
N/A
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Carved Mottled Greenish-Yellow Crystal/Glass Object
Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.
Man-made Object/Uncertain Mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Unable to identify - Image contains non-geological items
N/A
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
N/A (Non-Geological Object)
N/A
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Amethyst
Quartz (Silicon Dioxide with Iron impurities), SiO2
mineral
Amazonite
Microcline (KAlSi3O8) with Pb impurities
mineral
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Smoky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8
mineral
Amethyst (Quartz variety)
Amethyst - SiO2 (Silicon Dioxide with Iron impurities)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions
mineral
Sunstone
Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Beryl (likely Emerald or Aquamarine in matrix)
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst (Chevron Amethyst/Dream Amethyst)
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Limonite Pseudomorph after Pyrite
Limonite (Hydrous iron oxides e.g., FeO(OH)·nH2O) pseudomorphing Pyrite (FeS2)
mineral
Herkimer Diamond
Double-terminated Quartz (Silicon Dioxide, SiO2)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Almandine Garnet in Matrix
Almandine, Fe3Al2(SiO4)3
metamorphic
Chalcedony with Druzy Quartz Geode
Silicon Dioxide (SiO2)
mineral
Tanzanite (Rough)
Blue Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Vanadinite on Matrix
Vanadinite (Pb5(VO4)3Cl)
mineral
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
tektite
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Amethyst
Amethyst (Silicon Dioxide with iron impurities), SiO2
mineral
Amethyst
Crystalline Quartz (SiO2) with iron impurities
mineral
Amazonite
Potassium aluminum silicate (KAlSi3O8)
mineral
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral