Milky quartz (massive quartz)
Quartz, silicon dioxide (SiO₂)
mineral
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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Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily Quartz-based Sandstone)
sedimentary
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Quartzite River Stone
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Porphyritic Basalt
Basalt (with plagioclase or k-feldspar phenocrysts)
igneous
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
metamorphic
Quartzite River Cobble
Quartzite (dominated by SiO2)
metamorphic
Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Greenstone / Greenschist
Chlorite schist / Meta-basalt
metamorphic
Sandstone
Arenite
sedimentary
Weathered quartz-rich rock, likely quartzite or altered sandstone
Quartzite (mostly microcrystalline quartz, SiO₂); exact identification is uncertain from the photograph
metamorphic
Sandstone (with potential trace fossils)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Greenstone with Epidote or Quartz veins
Metabasalt (Greenstone facies)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Gneiss with Quartz Veining
Gneiss (High-grade Metamorphic Rock)
metamorphic
Greenschist
Chlorite Schist (Greenschist Facies)
metamorphic
Rhodonite Tumbled Chips
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Pink-and-green quartz-rich rock, likely rose quartz with epidote/serpentine
Quartz (SiO₂), variably colored by iron, with possible epidote, chlorite, or serpentine inclusions
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Greenstone
Metabasalt / Chlorite-actinolite-epidote schist
metamorphic
Ruby
Corundum (Al2O3:Cr)
gemstone
Chert (with Manganese Oxide coating)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (River Rock)
Arenite (SiO2 based sedimentary rock)
sedimentary
Sandstone with Lichen
Arenite (SiO2 based) with biological weathering
sedimentary
Quartzite (or Ferruginous Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
metamorphic
Feldspar (Orthoclase/Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Granite
Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)
igneous
Yellow Quartzite (River Pebble)
Quartzite (primarily SiO2 with iron oxide inclusions)
metamorphic
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
sedimentary
Likely citrine or yellow glass imitation in a silver-tone bracelet
Citrine: quartz, SiO₂; exact material cannot be confirmed visually
gemstone
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Sandstone
Arenite (mostly Quartz-based)
sedimentary
Blue Sapphire
Corundum (Al2O3)
gemstone
Ruby
Corundum (Al2O3)
mineral
Pink Sapphire
Corundum (Al2O3) with Chromium/Iron/Titanium trace impurities
mineral
Quartz-rich pegmatite or quartz vein rock
Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining
igneous
Weathered brown rock, likely sandstone or iron-rich quartzite
Indeterminate; probable quartz-rich sandstone (quartz, feldspar, iron oxides)
sedimentary
Green Aventurine
Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions
mineral