Banded gray stone, likely slate or fine-grained metamorphic rock
Probably slate or phyllite; composition commonly mica, quartz, and clay-derived minerals
metamorphic
Category
Metamorphic (Localized) Or Sedimentary
Browse metamorphic (localized) or sedimentary specimens identified by the Rock Identifier community.
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Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
White Quartz (Milky Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Pyrite-bearing metamorphic rock (likely schist or quartzite)
Mica/quartz-rich metamorphic matrix with pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)
metamorphic
Banded sandstone pebble
Quartz-rich lithic sandstone; exact provenance and composition require testing
sedimentary
Gneiss with Quartz Vein
Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection
metamorphic
Slate and shale outcrop
Slate: very low-grade metamorphosed shale, chiefly clay minerals, muscovite/illite, and quartz; associated shale may be present.
metamorphic
Tiger's Eye
Quartz pseudomorph after crocidolite (SiO2)
gemstone
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Ruby Zoisite
Anyolite (Calcium aluminium silicate with Chromium/Corundum inclusions)
metamorphic
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Raw selenite (gypsum)
Gypsum, CaSO₄·2H₂O; translucent variety selenite
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Dark metamorphic rock, likely schist or phyllite
Quartz–mica schist/phyllite; chiefly quartz, mica, and feldspar
metamorphic
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Quartz-rich limestone or calcitic marble
Calcite (CaCO₃), possibly with quartz (SiO₂)
metamorphic
Red Jasper
Microcrystalline Quartz (Chalcedony), SiO2
sedimentary
Banded Slate
Metamorphic Argillite / Slate
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Tumbled quartz-rich stone, likely milky quartz
Quartz (SiO₂), possibly iron-stained milky quartz or quartzite
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss
Metamorphic Gneiss
metamorphic
Almandine Garnet in Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Schist
Metamorphic Rock (Schist)
metamorphic
Quartzite
Metamorphic rock (SiO2)
metamorphic
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
metamorphic
Likely quartz-rich metamorphic rock (quartzite or quartz-veined schist)
Quartzite/siliceous schist; chiefly quartz (SiO₂), with probable mica and iron-oxide staining
metamorphic
Greenschist
Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)
metamorphic
Mixed river stones and gravel
Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate
igneous, sedimentary, metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral