Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Category
Mineral In A Matrix (Likely Quartz Or Feldspar)
Browse mineral in a matrix (likely quartz or feldspar) specimens identified by the Rock Identifier community.
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Pink Granite
Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)
igneous
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Feldspar, and Mica)
igneous
Granite
Granite (a common name for a felsic intrusive igneous rock)
Igneous Rock
Quartz (Milky or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (Metamorphic high-grade)
metamorphic
Granite Cobble
Felsic Intrusive Igneous Rock
igneous
Quartz (Granular Milky Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Granite
Granite
igneous
Amazonite
Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)
mineral
Epidosite (Epidote-rich rock)
Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
metamorphic
Basalt (Weathered Pebble)
Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene
igneous
Porphyritic Basalt
Basalt with plagioclase phenocrysts
igneous
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Quartzite (Milky Quartz pebble)
Silicon Dioxide (SiO2)
metamorphic
Arkosic Sandstone (or Conglomeritic Sandstone fragment)
Arkose (rich in feldspar)
sedimentary
Quartz (likely Rose Quartz or Milky Quartz based on color)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Polygenetic Breccia
Clastic Breccia (containing lithic fragments in a fine-grained matrix)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2 with minor Fe2O3)
sedimentary
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS)
mineral
Granite (Dioritic variant)
Granite (Phaneritic Igneous Rock)
igneous
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
Igneous
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Rhyolite
Rhyolite (felsic volcanic rock)
igneous
Pink Granite
Phaneritic plutonic igneous rock (Alkali-feldspar granite)
igneous
Granite
Granite (Phaneritic Quartz-Feldspar Rock)
Igneous
River Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper with Agate and Quartz Inclusions
Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate
sedimentary
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Sandstone (Weathered Pebble)
Arenite (SiO2 primarily)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Banded Gneiss
Gneiss
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (High Silica / Iron Oxide)
sedimentary
Granite
Granite (Felsic Intrusive Igneous Rock)
igneous
Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
mineral
Quartz (Smoky/Milky Variety)
Silicon Dioxide (SiO2)
mineral