Rounded greenstone river cobble
Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing
metamorphic
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Pink Quartzite
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Green Fuchsite in Quartz (sometimes called Green Aventurine)
Fuchsite (Chrome-rich Muscovite) K(Al,Cr)2(AlSi3O10)(OH)2 in Quartz SiO2
metamorphic
Carnelian Agate
Chalcedony (SiO2) with iron oxide inclusions
mineral
Carnelian
Chalcedony (SiO2)
mineral
Red Jasper
Silicon dioxide (SiO2) with Iron inclusions
mineral
Red Jasper (Siltstone variant)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Flint (or Chert)
Microcrystalline quartz (SiO2)
sedimentary
Unakite
Granitic rock composed of orthoclase, epidote, and quartz
metamorphic
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Likely dark mineral or rock fragment
Indeterminate from image; possibly a dark silicate mineral such as hornblende, biotite, or basalt
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Green Aventurine (Tumbled)
Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Rounded quartzite cobble
Quartzite, predominantly microcrystalline SiO₂
metamorphic
Rounded pale pebble, likely quartz-rich stone
Indeterminate; possibly quartzite, quartz-bearing granite, or calcite-rich limestone
igneous
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Red Jasper
Jasper (SiO2) with Hematite (Fe2O3) inclusions
sedimentary
Red Jasper
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Amethyst and mixed gemstone bracelet
Amethyst: purple quartz, silicon dioxide (SiO₂); likely accompanied by other quartz or decorative mineral beads
gemstone
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Greenschist
Greenschist (composed mainly of actinolite/tremolite, chlorite, and epidote)
metamorphic
Schist
Mica Schist (Metamorphic Rock)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Beach Pebble (Quartzite / Sandstone)
Quartz-rich sedimentary or metamorphic rock pebble
sedimentary
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Unakite
Altered Granite (Granitic Metamorphic Rock)
metamorphic
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Rhodonite
Rhodonite (Mn, Fe, Mg, Ca)SiO3
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Metallic sulfide-rich rock, possibly pyrite-bearing schist or marcasite specimen
Likely pyrite (FeS₂) in a foliated host rock; exact identification requires testing
metamorphic
Red Jasper
Silicon dioxide (SiO2) with iron oxide inclusions
mineral