Geode
Quartz / Chalcedony nodule
sedimentary
Category
Sedimentary Or Igneous Associated Mineral
Browse sedimentary or igneous associated mineral specimens identified by the Rock Identifier community.
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Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Greenstone / Graywacke
Metagraywacke or Chlorite Schist
metamorphic
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Small rounded pebble, likely quartz-rich sandstone or granitoid fragment
Uncertain; probable quartz/feldspar-bearing lithic pebble
sedimentary
Citrine
Silicon Dioxide (SiO2) with ferric iron impurities
gemstone
Carnelian Agate
Carnelian (SiO2 with iron oxide impurities)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Prehnite
Ca2Al(AlSi3O10)(OH)2
mineral
Epidote with quartz/feldspar
Epidote, Ca2(Al,Fe)3(SiO4)3(OH)
metamorphic
Weathered quartz-bearing metamorphic rock, likely mica schist or gneiss
Quartz–feldspar–mica assemblage; exact mineral identification requires testing
metamorphic
Fluorite with Quartz coating
Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)
mineral
Weathered metamorphic rock, likely schist or gneiss
Quartz–feldspar–mica metamorphic rock; exact identification requires testing
metamorphic
Quartz (Peach/Orange variety)
Silicon Dioxide (SiO2)
mineral
Polished blue stone, likely sodalite
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed jasper or lapis lazuli
mineral
Banded quartz-rich metamorphic rock (likely quartzite or quartz-mica schist)
Quartzite/schist composed chiefly of SiO₂ quartz with mica, feldspar, and iron-oxide or copper-colored accessory minerals
metamorphic
Moonstone (Feldspar)
Orthoclase or Oligoclase (KAlSi3O8)
mineral
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary
Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Gneiss (specifically Amphibolite Gneiss)
Gneiss
metamorphic
Carnelian
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Pyrite (Fool's Gold) in Matrix
Iron Disulfide (FeS2)
mineral
Vesicular basalt (scoria-like volcanic rock)
Vesicular basalt, primarily plagioclase feldspar, pyroxene, and olivine
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Weathered quartz-rich metamorphic rock, likely gneiss or quartzite
Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph
metamorphic
Carnelian
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Rhodochrosite
Rhodochrosite (MnCO3)
mineral
Celestite
Celestine (SrSO4)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pink Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral
Rounded river pebble, likely quartz-rich sandstone or weathered igneous rock
Indeterminate; possibly quartzite, sandstone, or fine-grained granitic rock
igneous