Engineer Quartz/Quartzite
SiO2 (Silicon Dioxide with binders)
Sedimentary or metamorphic-derived
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Iron-stained weathered rock
Unknown
Unknown (likely sedimentary or metamorphic)
Quartz fragment (Pebble)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal) Bracelet
Silicon Dioxide (SiO2)
gemstone
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
Rounded greenish river pebble
Indeterminate; possibly weathered greenstone, basalt, or serpentinized ultramafic rock
sedimentary
Granitic Gneiss
Gneiss (Granite-derived)
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Muscovite Schist with Quartz
KAl2(AlSi3O10)(OH)2 in Schistose matrix
metamorphic
Zoisite with Ruby (Anyolite)
Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8 (Feldspar group)
mineral
Ruby Zoisite
Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)
metamorphic
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Jasper (Red and Yellow)
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Carnelian (Orange Agate)
Carnelian (variety of Chalcedony, SiO2)
mineral
Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Jasper
SiO2
Mineral
Chalcedony (Agate) Pebble
Silicon Dioxide (SiO2)
mineral
Pale rounded quartz-rich pebble, likely quartzite
Quartzite (mostly microcrystalline SiO₂), possibly quartz-rich sandstone or vein quartz
metamorphic
Weathered quartz-rich pebble, possibly quartzite or chert
Quartz (SiO₂), possibly quartzite; exact identification is uncertain from the image
metamorphic
Mixed collection of common river stones
Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material
igneous, sedimentary, metamorphic
Weathered quartz-rich metamorphic pebble
Likely quartzite or quartz-mica schist; identification is uncertain from the photograph
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Quartz-rich stone fragment (probable quartzite or chert)
Quartzite, composed predominantly of SiO₂; exact identification is uncertain from the image
metamorphic
Green Aventurine
Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Slate
Slate; predominantly fine-grained phyllosilicates, commonly muscovite/illite and chlorite with quartz
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Exposed aggregate concrete (stone-chip surface)
Portland-cement concrete containing natural aggregate; not a natural rock
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Rounded greenish pebble
Indeterminate; possibly altered basalt, greenstone, or fine-grained serpentinite
sedimentary
Ruby in Zoisite
Anyolite (Ruby in Zoisite)
metamorphic
White Buffalo Turquoise (or Howlite/Magnesite)
Calcite/Dolomite or Magnesite with Chert/Quartz inclusions
gemstone
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Banded Marble (Egg Carving)
Metamorphosed Limestone (predominantly CaCO3)
metamorphic
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral