Feldspar (Orthoclase)
Potassium Alveolar Silicate (KAlSi3O8)
mineral
Category
Man Made Metamorphic Style Composite
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
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Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 + Au)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Grit)
Silicon Dioxide (SiO2)
mineral
Polished red banded stone, likely rhodonite
Rhodonite — manganese inosilicate, MnSiO₃; possibly rhodochrosite or dyed quartz
mineral
Iron-Nickel Meteorite
Siderite (Iron Meteorite)
meteorite
Sandstone
Arenite (predominantly SiO2 with iron oxides)
sedimentary
Granite Cobble
Granite (Phaneritic Quartz-Feldspar specimen)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz (or Chalcedony) Specimen
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
gemstone
Sodalite
Sodalite Na8(Al6Si6O24)Cl2
mineral
Green Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Quartzite with Iron Staining
Metamorphic Quartz Sandstone
metamorphic
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Coarse Sand or Fine Gravel
Detrital Sedimentary Fragments (mostly SiO2)
sedimentary
Kyanite
Kyanite (Al2SiO5)
mineral
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Serpentine
Serpentine subgroup (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartz Boulder
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
mineral
Weathered quartz-rich pebble (tentative)
Likely quartz/chalcedony, SiO₂, possibly iron-stained
mineral
Tumbled quartz (likely rose or milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Weathered granite (likely with accessory quartz)
Granite; chiefly quartz, K-feldspar, plagioclase, and biotite/hornblende
igneous
Tumbled orange calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Weathered quartz-rich cobble, possibly milky quartz with iron staining
Quartz (SiO₂), likely with iron-oxide/hydroxide coatings and minor host-rock inclusions
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper (Green)
Silicon dioxide (SiO2)
Mineral/Sedimentary
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with iridescent tarnish
mineral
Quartzite
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Blue Apatite
Fluorapatite / Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Clear Quartz
Silicon dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral