Weathered basaltic river pebble
Basalt, likely altered or partially vesicular basalt
igneous
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Iron-stained Quartz Pebble
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
mineral
Granite
Phaneritic felsic intrusive igneous rock
igneous
Limonite with Pyrite
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (containing quartz/agate or zeolite fill)
igneous
Amygdaloidal Basalt with Agate/Quartz Infill
Basalt with Secondary Silicate Mineralization (SiO2)
igneous
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Quartz with Iron Oxide
Silicon Dioxide (SiO2) with Fe2O3 inclusions
mineral
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Limonite
Limonite (FeOO·nH2O)
mineral
Clear Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Garnet Gneiss or Mica Schist with Garnet
Almandine Garnet-bearing Gneiss
metamorphic
Greenschist
Greenschist metamorphic rock (chlorite-epidote-actinolite-albite assemblage)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
metamorphic
Amygdaloidal Basalt
Vesicular Basalt with Mineral Infills
igneous
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Moss Agate
Silicon Dioxide with inclusions (SiO2 + Mn/Fe)
sedimentary
Dyed Agate Slice
Chalcedony (Silicon Dioxide, SiO2) with artificial pigment
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Basalt (with filled vesicles/amygdules)
igneous
Gneiss (Granulite / Foliated Metamorphic Rock)
Gneiss
metamorphic
Limonite with Hematite
Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Garnet Amphibolite (or Garnet Gneiss)
Garnet amphibolite / Garnet-bearing metamorphic rock
metamorphic
Schist
Mica Schist
metamorphic
Limonite (Iron Ore)
Hydrated ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Amygdaloidal Basalt
Basalt with secondary amygdule minerals (likely Epidote or Chlorite)
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly SiO2 or Zeolites)
igneous
Chalcedony on Matrix
Silicon Dioxide (SiO2)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Dalmatian Stone
Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite
igneous
Vesicular Basalt with Amygdules
Amygdaloidal Basalt
igneous
Agate (specifically crazy lace agate / orbicular agate node)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Copper slag or vesicular basalt with copper minerals
Industrial slag / Basaltic matrix with secondary copper minerals
igneous
Yellow Diamond (Faceted)
Diamond (C - Pure Carbon)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral