Quartz Geode
Silicon Dioxide (SiO2)
Category
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
Quartz Geode
Silicon Dioxide (SiO2)
Chert (with Quartz vein)
Chert (Silicon Dioxide, SiO2)
Perlite (Unexpanded)
Amorphous volcanic glass
Mica
Mica group (often Muscovite or Biotite)
Tiger's Eye
SiO2 (Silicon Dioxide)
Milky Quartz
Silicon Dioxide (SiO2)
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
Quartz-veined Basalt
Amygdaloidal or Porphyritic Basalt with Silicon Dioxide (SiO2) vein
Porphyritic basalt (likely amygdaloidal basalt)
Basalt containing larger plagioclase crystals and pale vesicle-fill minerals, commonly calcite, zeolite, or quartz
Quartz
Silicon Dioxide (SiO2)
Pink Granite (Alkali-feldspar Granite)
Felsic intrusive igneous rock (composition: KAlSi3O8, SiO2, NaAlSi3O8)
Dyed Blue Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
White Agate (Chalcedony)
Silicon Dioxide (SiO2)
Banded Agate (Dyed Purple)
Agate (Variety of Chalcedony/Quartz), SiO2
Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
Polished Agate (Yellow/Grey Agate Pendant)
Silicon Dioxide (SiO2)
Erythrite
Erythrite (Cobalt Bloom) - Co3(AsO4)2·8H2O
Quartz with Inclusions
Silicon Dioxide (SiO2)
Geode (Small unopened nodule)
Quartz-lined nodule (SiO2)
Limestone with Calcite Veins
Calcium Carbonate (CaCO3) - Sparry Limestone
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
Basalt with Vesicles
Vesicular Basalt
Sunstone
Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)
Amazonite
Potassium Feldspar (KAlSi3O8)
Peridot
Olivine ((Mg,Fe)2SiO4)
Smoky Quartz and Orthoclase Feldspar
Granitic Pegmatite (SiO2 + KAlSi3O8)
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Sandstone
Arenite
Hematite
Iron Oxide (Fe2O3)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
Howlite
Ca2B5SiO9(OH)5
Carnelian
Silicon Dioxide (Quartz variety), SiO2
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
Limonite / Goethite Ironstone Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
Pyrite
Iron Disulfide (FeS2)
Geode
Quartz / Chalcedony nodule with mineralized cavity
Graywacke Pebble with Quartz Vein
Argillaceous Sandstone (Graywacke)