Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Category
Igneous And Metamorphic Derivative (Weathered)
Browse igneous and metamorphic derivative (weathered) specimens identified by the Rock Identifier community.
Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or White Quartz)
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Iron aluminum silicate - Fe3Al2(SiO4)3
metamorphic
Quartzite with Quartz Geode / Vug
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Quartzite Pebbler
Quartzite (mainly SiO2)
metamorphic
Quartzite with inclusions
Metamorphosed Quartz-rich Rock (SiO2)
metamorphic
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Basalt (Weathered)
Extrusive mafic volcanic rock
igneous
Granite (Weathered)
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite (Weathered)
Granitic intrusive rock
igneous
Basalt (Weathered)
Extrusive Igneous Rock (Mafic composition)
igneous
Granite (Weathered)
Course-grained Intrusive Igneous Rock
igneous
Quartzite (clastic/metamorphic subtype)
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Granite (Weathered)
Plutonic Igneous Rock (Granitic)
igneous
Quartz (in a rock matrix)
Quartz (SiO2)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Greenschist
Greenschist (composed primarily of Chlorite, Actinolite, and Epidote)
metamorphic
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
mineral
Epidote Water-Worn Pebble
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
metamorphic
Granite
Intrusive igneous rock (high SiO2)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Pyrite (FeS2)
Mineral
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Granite (weathered)
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite (Weathered)
Granite (Felsic Plutonic Rock)
igneous
Granite (Weathered)
Phaneritic Felsic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Granite (Weathered)
Grano-diorite / Granite (SiO2 rich intrusive rock)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Arkosic Sandstone (or Conglomeritic Sandstone fragment)
Arkose (rich in feldspar)
sedimentary
Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral