Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Category
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Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Shale (possibly Carbonaceous or Oil Shale)
Argillaceous Sedimentary Rock
Sandstone (Pet Rock)
Clastic sedimentary rock (primarily SiO2)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
Quartz Pebble
Silicon Dioxide (SiO2)
Malachite Coating on Host Rock
Malachite [Cu2CO3(OH)2]
Chalcedony in Limestone Host Rock
Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous matrix
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
Basalt
Extrusive mafic igneous rock
River Rock
Sedimentary Rock (various compositions)
Granite
Granite (Felsic Plutonic Rock)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Gold-Bearing Quartz
Silicon Dioxide with Native Gold (SiO2 + Au)
Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2)
Agate Geode Slice
Silicon Dioxide (SiO2) with trace elements
Sandstone
Arenite (primarily Quartz-rich)
Sandstone nugget
Arenite (primarily Quartz SiO2)
Sandstone
Arenite (SiO2 based)
Sandstone
Arenite (SiO2 primarily)
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
Sandstone (likely Arkose or Lithic)
Clastic sedimentary rock (primarily SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Sandstone Pebble
Arenite (primarily SiO2)
Weathered Sandstone with Algae Growth
Arenite
Sandstone (likely Red/Brown Sandstone)
Arenite (SiO2 based)
Sandstone
Arenite (SiO2 based)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone
Arenite (SiO2 primarily)
Sandstone
Arenite (SiO2 based)
Sandstone (Ferruginous)
Sandstone (primarily SiO2 with Iron Oxide cement)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Sandstone (likely Calcareous or Micaceous)
Clastic sedimentary rock (primarily Quartz with Cementing Agents)
Sandstone (likely Quartz Sandstone)
Arenite (composed primarily of SiO2)
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Sandstone
Arenite
Sandstone
Arenite
Dalmatian Jasper
Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)
Quartz Geode (partially opened)
Silicon Dioxide (SiO2) with iron staining
Sandstone
Arenite (SiO2 primarily)
Gold Nugget
Native Gold (Au)
Sandstone
Arenite