Banded Agate
Agate (Silicon Dioxide, SiO2)
sedimentary
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
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Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
metamorphic
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Fluorite (Rainbow Fluorite Point)
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Biotite Mica in Quartz
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) in Quartz (SiO2)
mineral
Orthoclase Feldspar (Sunstone variety)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Orange Quartz (Citrine Quartz variety)
Silicon Dioxide (SiO2)
mineral
Assorted Tumbled Gemstones
Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)
mineral
Clear Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Quartzite
Quartzite (primarily SiO2)
metamorphic
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
Mineral
Chalcedony (Botryoidal or Tumbled)
Chalcedony (SiO₂)
mineral
Granite
Phaneritic Granitoid
igneous
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Greenstone with Epidote or Quartz Vein
Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)
metamorphic
Fluorite (likely Fluorite on Quartz/Matrix)
Calcium Fluoride (CaF2)
mineral
Bismuth
Bismuth (Bi)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Crocoite
Lead chromate (PbCrO4)
mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Copper-bearing Quartz (likely Malachite on Quartz matrix)
Cu2CO3(OH)2 (Malachite) on SiO2 (Quartz)
mineral
Black Tourmaline
Schorl (Sodium iron aluminum boron silicate hydroxide)
mineral
Amphibolite
Amphibolite (rich in amphibole and plagioclase feldspar)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Red Quartzite
Quartzite (primarily SiO2 with hematite inclusions)
metamorphic
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Graywacke
Lithic Sandstone (Graywacke)
sedimentary
Greenstone (Diabase or Metabasalt)
Metamorphosed Mafic Igneous Rock
metamorphic