Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Category
Sedimentary Rock (Specifically A Concretion Or Possibly A Geode)
Browse sedimentary rock (specifically a concretion or possibly a geode) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Specifically A Concretion Or Possibly A Geode) in the encyclopedia
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Quartz Geode
Silicon Dioxide (SiO2) in Host Rock
sedimentary
Moqui Marble (Moqui Ball)
Ironstone Concretion (Goethite/Hematite cemented Sandstone)
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Chert (specifically Flint or Dark Chert)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Geode (Quartz / Chalcedony Geode)
Silicon Dioxide (SiO2) - Quartz / Chalcedony
sedimentary
Moqui Marble
Iron Oxide Concretion (Fe2O3 / FeO(OH))
sedimentary
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities and natural radiation influence)
mineral
Amethyst (Chevron Amethyst)
Amethystine Quartz (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Moqui Marble (Shaman Stone)
Ironstone Concretion (Iron oxide Fe2O3 and FeO(OH))
sedimentary
Unknown Organic Object (likely a berry or fruit)
Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.
Organic Material (likely a fruit or berry)
Druzy Quartz (part of a Geode)
Silicon Dioxide (SiO2)
mineral
Brecciated stone pebble
Breccia
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)
sedimentary
Limestone (specifically Chalky Limestone)
Calcium Carbonate (CaCO3 / Calcite)
sedimentary
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Ironstone Concretion (Moqui Marble variety)
Ferruginous Sandstone Concretion
sedimentary
Chalcedony with Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (likely Graywacke or Siltstone variety)
Clastic Sedimentary Rock (SiO2 with assorted mineral fragments)
sedimentary
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Quartz Geode
Silicon dioxide (SiO2)
sedimentary
Pyrite Concretion
Iron Sulfide (FeS2) in Sedimentary Matrix
sedimentary
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Oco Geode
Silicon Dioxide (SiO2) with various inclusions
mineral
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Septarian Nodule Geode
Septarian concretions (composed of Calcite, Aragonite, and Limestone)
sedimentary
Chert Concretion
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Jasper (Petrified Wood variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2 with mineral cement)
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion
sedimentary
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, and Limestone)
sedimentary
Geode
Silicon Dioxide (Quartz/Chalcedony) in carbonate or volcanic host rock
sedimentary
Limonite (Ironstone Concretion)
Limonite: FeO(OH)·nH2O
sedimentary
Sandstone Concretion
Clastic Sedimentary Rock - Quartz Arenite / Sandstone
sedimentary