Pyrite
Iron Sulfide (FeS2)
mineral
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
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Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Magnetite
Magnetite (Fe3O4)
mineral
Quartz (Pink / Rose Quartz variant)
Silicon Dioxide (SiO2)
mineral
Jasper Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Sandy Ironstone
Ferruginous Sandstone
sedimentary
Vein-filled Sedimentary Rock
Silicified sedimentary rock with quartz/calcite vein
sedimentary
Quartz (Rose Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate / Chert)
Silicon Dioxide (SiO2)
mineral
Bloodstone
Chalcedony quartz variety (SiO2) with inclusions
mineral
Banded Agate (Tumbled)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Chalcedony (Agate/Chert)
Silicon Dioxide (SiO2)
mineral
Carnelian (Agate)
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Agate / Chalcedony Pebble
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) within a geode structure
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Graphic Granite (or Pegmatite with Tourmaline/Biotite)
Alkali-feldspar granite pegmatite
igneous
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Quartz-bearing volcanic rock, likely vesicular basalt
Basalt with secondary quartz (SiO₂) and possible zeolite/chalcedony infill
igneous
Granite
Granite (Mainly Quartz, Feldspar, and Mica)
igneous
Quartz River Pebble (Iron-Stained)
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Copper Ore (Malachite and Azurite stained rock)
Cupriferous rock containing secondary copper carbonates
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (Orange/Pink variety)
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (KAlSi3O8)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Limonite-stained Chert
Microcrystalline Quartz (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Botryoidal Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Aventurine Quartz
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Quartz Vein in Basalt
Silica-infilled basaltic host rock
igneous
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Granite
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8), and Mica)
igneous
Blue Quartz
Silicon Dioxide (SiO2) with fibrous inclusions (such as tourmaline, magnesio-riebbeckite, or crocidolite)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary