Agate Pebble (Desert Agate / Chalcedony Nodule)
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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Agate (Water-Worn Pebble)
Silicon Dioxide (SiO2) - Chalcedony
mineral
Apatite
Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Amethyst Geode
Quartz (SiO₂) with iron impurities
Mineral/Igneous (secondary formation)
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with impurities
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Labradorite
(Na, Ca)(Si, Al)4O8
mineral
Dalmation Stone (often called Dalmatian Jasper)
Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite
igneous
Turquoise
Hydrous phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Diamond
Native Carbon (C)
mineral
Diamond
Diamond (pure carbon C)
mineral
Amethyst (Raw Quartz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Chert (with Calcite layering)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
sedimentary
Magnetite / Ironstone
Iron(II,III) oxide (Fe3O4)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Sulfur
Native Sulfur (S8)
mineral
Sandstone (with Iron Staining)
Arenite (Siliclastic sedimentary rock)
sedimentary
Potassium Feldspar (Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Fossiliferous Sandstone / Fossil Fragment
Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material
fossil
Potassium Feldspar
K-Feldspar (KAlSi3O8)
mineral
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Carnelian
SiO2 (Silicon Dioxide - Chalcedony variant)
mineral
Chalcedony (Tumbled Pebble)
Silicon Dioxide (SiO2)
mineral
Carnelian
SiO2 (Chalcedony with iron oxide impurities)
mineral
Chalcedony (Agate/Seashell replacement)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Quartz Druzy in Brecciated Matrix
Silicon Dioxide (SiO2) in Lithic Breccia
sedimentary
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Mineral
Quartz Vein in Host Rock (likely Sandstone or Mudstone)
Silicon Dioxide (SiO2) within Sedimentary Matrix
sedimentary
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Green Aventurine
Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions
mineral
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Carnelian Agate / Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Basalt (with possible weathering or secondary mineral crust)
Basalt (Aphanitic Mafic Igneous Rock)
Igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Brown Quartz Pebble
Silicon Dioxide (SiO2)
mineral