Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Feldspar, and Mica)
igneous
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper (Iron-rich Chalcedony)
Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)
Sedimentary / Metamorphic
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral
Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions
Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)
igneous/metamorphic
Silver (Jewelry Specimen)
Native Silver (Ag)
Mineral (Native Element)
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
White Agate (Chalcedony)
Chalcedony (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine/Pyrope variety)
Silicate mineral group; typically Fe3Al2(SiO4)3 (Almandine) or Mg3Al2(SiO4)3 (Pyrope)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartz (Milky/Common)
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Banded Agate (specifically Carnelian Agate color)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Amethyst (Quartz)
SiO2 (Silicon Dioxide)
mineral
Quartz (Drusy/Crystalline variety)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss (with Quartz Vein)
Gneiss (Metamorphic rock of varying mineralogy)
metamorphic
Chert Pebble (with Quartz Vein)
Chert (Cryptocrystalline Silica - SiO2)
sedimentary
Chert (specifically a variety like Flint or River Jasper with Iron Oxidation)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz / Limestone Gravel
SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)
igneous and sedimentary mixture
Quartz (pebble)
Quartz (SiO₂)
Mineral
Iridescent Ammonite
Ammonoidea (Species: likely Cleoniceras or Desmoceras); Mineral: Aragonite/Ammolite (CaCO3)
sedimentary (fossilized)
Botryoidal Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Chrysocolla
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary