Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Igneous And Metamorphic Derivative (Weathered)
Browse igneous and metamorphic derivative (weathered) specimens identified by the Rock Identifier community.
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Banded gneissic rock
Gneiss, likely quartz–feldspar–biotite gneiss
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Eclogite
Eclogite (Omphacite-Garnet rock)
metamorphic
Magnetite (Octahedral Crystal)
Magnetite (Fe3O4)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Likely weathered quartz or quartz-rich pebble
Quartz, silicon dioxide (SiO₂)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Rounded basalt cobble (probable)
Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene
igneous
Blue Quartz (Dumortierite Quartz)
SiO2 with inclusion of AlAl6BSi3O18
mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Greenstone
Greenschist
metamorphic
General river rock or weathered cobble
Mixed rock composition
igneous/metamorphic
Green aventurine quartz (probable)
Quartz, SiO₂, with fuchsite or other green mica inclusions
mineral
Quartz-rich pegmatite (likely feldspar–quartz rock)
Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining
igneous
Quartz-rich rock, likely milky quartz vein material
Quartz (SiO₂), possibly quartzite or quartz-bearing pegmatite
igneous
Weathered quartz-rich metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica gneiss/schist (tentative; image resolution limits certainty)
metamorphic
Mixed rounded river pebbles, likely basalt and granite
Basalt (fine-grained mafic rock) and granite/granitoid (quartz–feldspar rock)
igneous
Polished river pebble, likely granite or granitic gneiss
Quartz–feldspar–mica aggregate; possibly biotite granite (compositionally near granite)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz pebble
SiO2
mineral
Dark metamorphic rock, likely hornfels or fine-grained basalt
Probable hornfels; commonly quartz–feldspar–mica with variable amphibole/pyroxene
metamorphic
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Schist
Mica Schist (Foliated Metamorphic Rock)
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Polished pink-and-black granite or gneiss
Granite–gneiss, chiefly quartz, feldspar, and biotite/amphibole
igneous
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Weathered gneissic metamorphic rock
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rounded white pebble, likely quartz or feldspar
Most consistent with milky quartz (SiO₂), though altered feldspar or calcite is possible from the image
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Gold Ore
Native Gold (Au) in Matrix
mineral
Weathered basalt or mafic metavolcanic rock
Basalt, possibly altered to greenstone (chlorite–epidote–actinolite assemblage)
igneous
Gravel / Small Pebble
Rock Fragment (Gravel)
sedimentary
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Tumbled milky quartz pebble
Quartz, silicon dioxide (SiO₂), microcrystalline to coarsely crystalline variety
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral