Howlite
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Category
Mineral, Often Found As A Rock (Metamorphic)
Browse mineral, often found as a rock (metamorphic) specimens identified by the Rock Identifier community.
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Quartzite
Quartzite
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Red Jasper
Microcrystalline Quartz (SiO2) with Hematite inclusions
sedimentary
Quartz
Silicon dioxide (SiO2)
Mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Flower Agate
Chalcedony (SiO2) with Scolecite/Opaque inclusions
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite with Quartz)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Quartzite with Feldspar and Mica (Granitic Gneiss Pebble)
Metamorphic Rock / Quartzite / Granitic Gneiss
metamorphic
Milky Quartz with Mica and Pyrite
Quartz (SiO2) with Muscovite (KAl2(AlSi3O10)(OH)2) and Pyrite (FeS2)
mineral
Quartz with Chalcopyrite and Pyrite
Silicon Dioxide (SiO2) with Copper Iron Sulfide (CuFeS2)
mineral
Chert (Flint)
Chert (SiO2)
sedimentary
Milky Quartz with Chlorite inclusion
Silicon Dioxide (SiO2) with Chlorite group inclusions
mineral
Quartzite Pebble
Metamorphic Quartz-rich Rock (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
mineral
Green Jasper
Silicon Dioxide (SiO2) with iron and silicate inclusions
sedimentary
Unakite or Epidosite
Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)
metamorphic
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Mineral
Banded Gneiss
Gneiss
metamorphic
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Celestine (or Celestite) Geode
Strontium Sulfate (SrSO4)
mineral
Gold Ore in Matrix
Native Gold (Au) in Quartz/Limonite host rock
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Chert (variations include Flint)
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Garnet-bearing rock (likely almandine garnet in a metamorphic matrix)
Almandine garnet, Fe₃Al₂(SiO₄)₃; host rock is uncertain from the image
metamorphic
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2)
sedimentary
Likely garnet-bearing rock (possibly almandine garnet in matrix)
Garnet, likely almandine (Fe₃Al₂Si₃O₁₂); host rock cannot be determined from the image
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone with Liesegang Rings
Quartzose Sandstone with Iron Oxide Precipitation
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Glaucophane Schist (Blueschist)
Blueschist (Glaucophane-bearing schist)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic