Druzy quartz geode
Microcrystalline quartz (SiO₂), commonly lining a volcanic geode cavity
mineral
Category
Man Made Rock (Technosol)
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Carnelian Agate / Iron-Stained Quartz
SiO2
Mineral
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Limestone (specifically Travertine or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) in Geodic habit
mineral
Yellow Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Quartz Geode with Calcite
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
mineral
Peridotite (Pyroxenite/Serpentinized Dunite)
Ultramafic Rock (consisting primarily of Olivine and Pyroxene)
igneous
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Puddingstone (Gowganda Tillite/Jasper Conglomerate)
Jasper Conglomerate (SiO2 primary composition)
sedimentary
Greenstone / Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Quartz Vein in Sedimentary Matrix
Silicon Dioxide (SiO2) with host rock
mineral
Basalt (River Pebble)
Mafic volcanic rock (rich in magnesium and iron)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
White Topaz
Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2
mineral
Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
metamorphic
Sandstone (Iron-stained)
Arenite with Limonite/Hematite staining
sedimentary
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Snakeskin Jasper
Microcrystalline Quartz (SiO2) with iron inclusions
sedimentary
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Mexican Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
mineral
Painted Rock / Geode Specimen
Silicon Dioxide with artificial pigment coating
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony / Quartz Variety
Mineral
Sandstone (specifically Banded Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Schist
Mica Schist (Medium-grade Metamorphic Rock)
Metamorphic
Vesicular Basalt (Scoria)
Basalt (Vesicular texture)
igneous
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Serpentinite
Serpentine group minerals ((Mg, Fe)3Si2O5(OH)4)
metamorphic
Rhyolite with Lithophysae and Iron Oxide
Extrusive igneous rock / Felsic volcanic rock
igneous
River Stone (Basalt or Siltstone)
Mafic Volcanic Rock or Clastic Sedimentary Rock
igneous or sedimentary
Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
sedimentary
Quartz (Milky/Crystalline)
Silicon Dioxide (SiO2)
mineral
Conglomerate
Conglomerate rock
sedimentary
Conglomerate
Conglomerate rock
sedimentary
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Botryoidal chalcedony (possibly agate/geode material)
Microcrystalline quartz, SiO₂; commonly chalcedony with quartz-lined cavities and iron-oxide staining
mineral
Basalt (Beach Pebble)
Extrusive mafic igneous rock
igneous