Serpentinized ultramafic rock (likely serpentinite)
Serpentinite; chiefly antigorite/lizardite/chrysotile, commonly after peridotite (olivine–pyroxene)
metamorphic
Category
Sedimentary Or Metamorphic Derived
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
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Unakite
Altered Granite (Epidotized Granite)
metamorphic
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Mixed stream gravel and common rock specimens
Predominantly quartz-rich granitoid, quartzite, sandstone, shale/slate, and mafic volcanic fragments; exact species cannot be determined confidently from the image
igneous, sedimentary, metamorphic
Jasper with Iron Staining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Beach Pebble (Quartzite / Sandstone)
Quartz-rich sedimentary or metamorphic rock pebble
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with hematite inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide (Fe2O3) inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Red Jasper (nodule)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Mica Schist
Mica Schist (primarily muscovite and biotite)
metamorphic
Zoisite with Ruby (Anyolite)
Anyolite (Ca2Al3(SiO4)3(OH) + (Hb, Al, Cr)2O3)
metamorphic
Schist
Mica Schist
metamorphic
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Mica Schist
Schist (Biotite/Muscovite rich)
metamorphic
Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Quartz)
metamorphic
Serpentine
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Botryoidal Chalcedony (Geode fragment)
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (SiO2, Silicon Dioxide with Iron Oxide impurities)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Serpentine (Serpentinite)
Mg3Si2O5(OH)4
metamorphic
Mica schist
Mica schist (Muscovite and Biotite group)
metamorphic
Mica Schist
Mica Schist (contains Muscovite/Biotite, Quartz)
metamorphic
Dark gray slate (possibly argillite or shale)
Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals
metamorphic
Unakite (Epidotized Granite)
Unakite; primarily composed of Epidote (Ca2(Al,Fe)3(SiO4)3(OH)), Orthoclase (KAlSi3O8), and Quartz (SiO2)
Metamorphic
Unakite
Altered Granite (Epidotized Feldspar with Quartz)
metamorphic
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Jasper (specifically Yellow Jasper and Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Feldspar (likely Orthoclase or Plagioclase)
Tectosilicate Feldspar (KAlSi3O8 to (Ca,Na)(Al,Si)4O8)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
mineral
Aventurine
Aventurine Quartz (SiO2)
mineral
Red Jasper (possibly Brecciated)
Jasper (Silicon Dioxide, SiO2)
sedimentary
Serpentinized ultramafic rock with magnesite
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with likely magnesite (MgCO₃) and minor chromite/magnetite
metamorphic
Greenstone / serpentinized ultramafic rock (probable)
Serpentinite, chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite and talc
metamorphic
Weathered quartz-rich pebble
Quartz (SiO₂), possibly quartzite or quartz-bearing vein rock
mineral