Quartzite pebble with Quartz vein
Quartzite (SiO2)
metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Phyllite
Phyllite (regional metamorphic rock)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Greenstone
Chlorite schist / Meta-basalt
metamorphic
Feldspar-rich Granite (or Gneiss) Pebble
Granite (primarily Orthoclase Feldspar and Quartz)
igneous
Green Aventurine
Quartz with fuchsite inclusions (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Rhodolite Garnet
Mg3Al2(SiO4)3 - Fe3Al2(SiO4)3 (Pyrope-Almandine series)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Sandstone (likely Siltstone)
Arenite or Siltstone (high SiO2 content)
sedimentary
Tumbled greenstone/chlorite-rich pebble
Likely chlorite-rich greenschist or altered basalt; exact identification requires testing
metamorphic
Green Aventurine
Silicon Dioxide with Fuchsite (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
gemstone
Ruby (Corundum)
Aluminum Oxide (Al2O3) with Chromium traces
mineral
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Greenstone / altered basalt fragment
Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing
igneous
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Greenish translucent mineral fragment
Indeterminate; possibly serpentine, epidote, or green glassy feldspar
mineral
Yellow Sapphire (Raw)
Corundum (Al2O3)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron traces)
mineral
Emerald (Rough)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Likely quartzite pebble
Quartzite, predominantly crystalline SiO₂
metamorphic
Banded gneiss
Gneiss; typically quartz–feldspar–mica assemblage
metamorphic
Rose Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Quartz-rich metamorphic rock (likely quartzite)
Quartzite, dominantly crystalline SiO₂, with probable iron-oxide staining and minor feldspar/mica
metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly crystalline quartz (SiO₂), possibly with mica and feldspar
metamorphic
Sandstone (River Cobble)
Clastic sedimentary rock (primarily SiO2 with various lithic fragments)
sedimentary
Sapphire (Corundum)
Corundum (Al2O3), variety Sapphire
Mineral
Tektite (Indochinite)
Natural glass (High-silica impact glass)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Garnet Schist
Almandine Garnet in Micaceous Schist
metamorphic
Gold
Gold (Au)
mineral
Microcline (Potassium Feldspar)
Microcline (KAlSi3O8)
mineral
Rounded basalt cobble
Basalt (fine-grained mafic volcanic rock)
igneous
Sandstone
Arenite
sedimentary