Orthoclase Feldspar
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Category
Mineral Variant
Browse mineral variant specimens identified by the Rock Identifier community.
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Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Limestone (Travertine/Tufa variant)
Calcium Carbonate (CaCO3)
sedimentary
Granite (Micro-specimen)
Plutonic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Psilomelane (Manganese Ore)
Psilomelane (Ba,H2O)2Mn5O10
mineral
Banded Chert / Sandstone Pebble
Microcrystalline Quartz (SiO2) / Silicified Sandstone
sedimentary
Quartz (Pink / Rose Quartz variant)
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Sandstone (with Chert/Quartzite)
Arenite (primarily SiO2)
sedimentary
Chert (Nodule)
Chert (composed of Microcrystalline Silica/SiO2)
sedimentary
Chert (Common Opal variant)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (River Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Red Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Granite (Felsic Plutonic Rock / SiO2 + Al2O3 + K2O + Na2O + CaO + FeO + MgO)
igneous
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (lithic)
Lithic Wacke / Arenite
sedimentary
Slag Glass (Leland Blue variant)
Anthropogenic Vitreous Silicate
mineral
Chalcedony (Common Opal variant or Agate pebble)
Silicon dioxide (SiO2)
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Sandstone
Arenite (Sedimentary rock comprising sand-sized grains)
sedimentary
Chert (and Flint variant)
Chert (SiO2)
sedimentary
Serpentine
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Serpentine (Serpentinite)
Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Fe)2O5(OH)4)
metamorphic
Chert (Jasper/Quartzite variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Desert Rose (Baryte or Gypsum Rose)
Baryte (BaSO4) or Gypsum (CaSO4·2H2O)
mineral
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Course-grained intrusive igneous rock
igneous
Red Granite
Phaneritic Felsic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Ferruginous Sandstone
Sandstone (enriched with Iron Oxide)
sedimentary
Granite
Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)
igneous
Amethyst
Silicon dioxide (variant with ferric iron impurities), SiO2
mineral
Chert (variant Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint (Yellow Jasper Variant)
Microcrystalline Quartz (SiO2 with Iron Oxide impurities)
sedimentary