Coarse Sand Grain / Lithic Fragment
Clastic Sediment (Lithic fragment or Quartz/Feldspar grain)
sedimentary
Category
Metamorphic Or Igneous
Browse metamorphic or igneous specimens identified by the Rock Identifier community.
Learn about Metamorphic Or Igneous in the encyclopedia
View all →
Agate
Banded Chalcedony (SiO2 - Silicon Dioxide)
mineral
White Quartz Pebble (with possible Quartz Geode cavity)
Silicon Dioxide (SiO2)
mineral
Magnetite (potentially as a Lodestone or within Ironstone)
Magnetite (Fe3O4)
mineral
Gneiss with Quartz Vein
Gneiss (containing SiO2 vein)
metamorphic
Gneiss
Gneiss
metamorphic
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Quartz with Mica (likely Muscovite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride
igneous/metamorphic
Quartz
SiO₂ (Silicon Dioxide)
Mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Granitic Gneiss
Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Agate
Chalcedony (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase (Potassium Aluminum Silicate, KAlSi3O8) with inclusions of Albite
mineral
Quartz (Milky/Cloudy Variety)
Silicon Dioxide (SiO2)
mineral
Chrysocolla
Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine/Lemon Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Smoky Quartz on Matrix
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Sea Glass-like Quartz)
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions
Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)
igneous/metamorphic
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Vesicular Basalt with Zeolite
Mafic volcanic rock with Hydrated Aluminosilicate minerals (Zeolite group)
igneous
Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Gneiss
Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)
metamorphic
Blue Sapphire (Raw)
Corundum (Al2O3)
mineral
Moonstone
Adularia (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Amethyst
Amethyst (variety of Quartz, SiO2)
mineral
Quartz Sand Grain
Silicon Dioxide (SiO2)
mineral
Amethyst (Ametrine or Bicolor Quartz variant)
Silicon Dioxide (SiO2) with iron impurities
mineral