Sandstone
Arenite (SiO2 based)
sedimentary
Category
Mineral, Often Found As A Rock (Metamorphic)
Browse mineral, often found as a rock (metamorphic) specimens identified by the Rock Identifier community.
Cloudy Quartz / Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Quartz (Rutilated)
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Dumortierite Quartz
Al7BO3(SiO4)3O3 (inclusion in SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
White Moonstone (Feldspar)
Potassium aluminum silicate (KAlSi3O8)
mineral
Granitic Pegmatite Intrusion in Host Rock
Pegmatite dike in amphibolite or schist
igneous and metamorphic
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Concretion
Sedimentary Concretion (e.g., Siderite or Ironstone)
sedimentary
Gneiss (Granite Gneiss)
Gneiss
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
mineral
Wishing Stone with Quartz Veins
Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)
metamorphic
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Quartz (Common or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Scoria
Scoria
Igneous
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral
Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt
Igneous
Specular Hematite with Pyrite
Iron Oxide (Fe2O3) with Iron Sulfide (FeS2)
mineral
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)
Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
Mineral
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Pebbles
Silicon Dioxide (SiO2)
mineral
Staurolite (Fairy Cross)
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Sandstone Concretion
Ferruginous Sandstone Concretion (Primarily SiO2 with Iron Oxide cement)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Quartz (Milky or Clear fragment)
Silicon Dioxide (SiO2)
mineral
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic