Quartz Fragment
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic (Localized) Or Sedimentary
Browse metamorphic (localized) or sedimentary specimens identified by the Rock Identifier community.
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Quartz
Silicon dioxide (SiO2)
Mineral
Educational Geologic Collection
Mixed Mineral and Rock Collection (Various compositions)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Epidote–garnet schist (probable)
Epidote + garnet + quartz/feldspar mica schist; garnet may be almandine–grossular series
metamorphic
Weathered quartz-rich metamorphic rock, likely quartzite
Quartzite (mostly microcrystalline quartz, SiO₂), possibly altered sandstone
metamorphic
Pink Rhodonite
Manganese Silicate (MnSiO3)
mineral
Garnet-Mica Schist
Garnetiferous Porphyroblastic Schist
metamorphic
Magnetite (Octahedral Crystal)
Magnetite (Fe3O4)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Almandine Garnet in Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Schist/Quartz Matrix
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral
Rhodonite
Manganese Inosilicate (Mn,Fe,Mg,Ca)SiO3
mineral
Kyanite
Kyanite (Al2SiO5)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Raw selenite (gypsum)
Gypsum, CaSO₄·2H₂O; translucent variety selenite
mineral
Weathered dark stone, possibly basalt
Basalt; commonly plagioclase feldspar, pyroxene, and minor olivine
igneous
Likely biotite-rich mica schist
Mica schist, chiefly biotite (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂); exact identification from image is uncertain
metamorphic
Sandstone pebble
Sandstone (arenite / quartzarenite)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Dark metamorphic rock, likely biotite schist or hornblende-bearing gneiss
Probable mica schist/amphibolite; composition may include biotite, amphibole, quartz, feldspar, and iron oxides
metamorphic
Tan quartz-rich rock, likely sandstone or weathered quartzite
Quartz sandstone; primarily SiO₂ with possible feldspar and iron-oxide cement
sedimentary
Weathered quartz-rich rock, likely chert or quartzite
Microcrystalline quartz (SiO₂), possibly with iron-oxide staining
sedimentary or metamorphic
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Pyrite (FeS2)
Mineral
Weathered foliated metamorphic rock, likely schist or gneiss
Mica schist to gneiss; commonly quartz + feldspar + biotite/muscovite
metamorphic
Banded metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly amphibolite-bearing
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Slate
Metamorphic Pelitic Rock
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Pearl necklace
Pearl, primarily aragonite (CaCO₃) and conchiolin
gemstone
Clear quartz crystal
Quartz, silicon dioxide (SiO₂)
mineral
Blue-gray calcite (likely cleavage specimen)
Calcite, CaCO₃
mineral
Polished river pebble
Indeterminate fine-grained fluvial clast, likely sandstone or chert
sedimentary
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral