Quartz Pebble (Geode Nodules / Stream-Rounded Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Gneiss
Gneiss
metamorphic
Greenstone / Chert
Cryptocrystalline Quartz (SiO2) or Altered Basalt
sedimentary or metamorphic
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Gneiss
Orthogneiss / Paragneiss
metamorphic
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Ferruginous Quartz
Iron-stained Quartz (SiO2 with Fe2O3 impurities)
mineral
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Chert (specifically Jasper or Brown Chert node)
Microcrystalline Quartz (SiO2)
sedimentary
Limonite with Quartz
Hydrated Iron Oxide Hydroxide with Silicon Dioxide (FeO(OH)·nH2O + SiO2)
mineral
Basalt with Amygdules
Extrusive Igneous Rock (Mafic)
igneous
Pink Feldspar
Potassium Feldspar (Microcline or Orthoclase), KAlSi3O8
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Garnet (Almandine variety)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Sand and Gravel (Quartz-rich)
Unconsolidated fluvial/beach sediment (primarily Silica/SiO2)
sedimentary
Gneiss (with Garnet)
Gneiss (Feldspar-Quartz-Biotite-Garnet Metamorphic Rock)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt with Secondary Mineral Amygdules
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (with secondary mineral infilling)
igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Porphyritic basalt (vesicular basalt)
Basalt; fine-grained mafic rock, commonly composed of plagioclase, clinopyroxene, olivine, and iron-titanium oxides
igneous
Olivine Basalt (with Epidote and Serpentine)
Mafic Volcanic Rock (Basalt)
igneous
Chert (specifically a stream-worn Chert Nodule)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Druse (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Limonite or Goethite (Ironstone)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Kaolinite (China Clay)
Kaolinite (Al2Si2O5(OH)4)
sedimentary
Limonite
FeO(OH)•nH2O
mineral
Rose Quartz
Rose Quartz (SiO2)
mineral
Limonite (Ironstone)
Goethite/Limonite (Hydrated iron(III) oxide-hydroxide)
mineral
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Greenstone
Metabasalt
metamorphic
Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Quartz in Matrix
Silicon Dioxide (SiO2)
mineral
Yellow Ochre / Limonite
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Amygdaloidal Basalt
Vesicular basalt with mineral infillings
igneous
Quartz with Iron Oxide Stain
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
mineral
Quartz geode or quartz-bearing rock
Quartz (SiO₂), likely in a chalcedony- or basalt-hosted cavity
mineral
Banded Agate
Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz with Iron Oxides
Silicon Dioxide (SiO2) with Fe2O3 inclusions
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Weathered basalt pebble
Basalt, a fine-grained mafic volcanic rock; likely containing plagioclase and pyroxene with weathering products
igneous