Sapphire
Corundum (Al2O3)
mineral
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Chert (specifically Jasper or Brown Chert node)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Limonite with Pyrite
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
mineral
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Agate (Plume or Moss Agate variant)
Chalcedony (SiO2) with various inclusions
mineral
Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Quartz (Milky/Crystal variety)
Silicon Dioxide (SiO2)
mineral
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Quartz / Iron-Stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions/staining
mineral
Garnet Amphibolite (or Garnet Gneiss)
Garnet amphibolite / Garnet-bearing metamorphic rock
metamorphic
Copper-bearing Quartz (likely Malachite on Quartz matrix)
Cu2CO3(OH)2 (Malachite) on SiO2 (Quartz)
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Dalmation Stone (Dyed)
Peralkaline rhyolite
igneous
Gneiss
Gneiss
metamorphic
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Yellow Quartz (Citrine or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Limonite
Limonite (FeOO·nH2O)
mineral
Limonite Nodules / Goethite
Hydrated Iron Oxide-Hydroxide (FeO(OH)·nH2O / Fe2O3·nH2O)
mineral
Vesicular basalt (scoriaceous basalt)
Basalt, primarily plagioclase, pyroxene, and iron-rich olivine; vesicular variety may be termed scoria
igneous
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Quartz Druzy (on Calcedony/Quartz base)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-Grade Metamorphic Rock)
metamorphic
Sapphire Rough (Corundum)
Corundum (Aluminum Oxide, Al2O3)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Agate (Banded Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Diamond
Diamond (pure carbon, C)
mineral
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Limonite with Hematite
Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
mineral
Gneiss
Gneiss
metamorphic
Greenstone
Metabasalt / Greenschist
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic