Smoky Quartz and Chalcedony Geode Fragment
Silicon Dioxide (SiO2)
mineral
Category
Mineral Within A Sedimentary Rock
Browse mineral within a sedimentary rock specimens identified by the Rock Identifier community.
Amethyst Geode
Silicon Dioxide with impurities (SiO2)
mineral
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Desert Rose
Gypsum (variety Selenite) - CaSO4·2H2O
mineral
Druzy Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Labradorite (tumbled)
Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)
Mineral
Granite
Granite
igneous
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Chert (Basanite variety) with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Shale
Argillaceous Rock
sedimentary
Quartz-veined Sedimentary Rock
Hydrothermally veined Clastic Sedimentary Rock (SiO2 veins in Matrix)
sedimentary
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Tiger's Eye (Inlaid in a band)
SiO2 (Silicon Dioxide with Crocidolite inclusions)
mineral
Epidote in Basalt
Epidotized Basalt (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) in Mafic Igneous Host)
igneous
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
White Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and magnesium inclusions
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Ruby in Zoisite
Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende
Metamorphic Rock (specifically a rock composed of minerals)
Sandstone (likely Greywacke or Lithic Sandstone)
Arenite / Wacke
sedimentary
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pebble (likely Sandstone or Granitic Pebble)
Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)
Rock (likely Sedimentary)
Sandstone
Arenite (primarily SiO2)
sedimentary
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Limonite (Ochreous)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Moonstone
Orthoclase feldspar ((K,Na)AlSi3O8)
mineral
Greywacke (likely)
Greywacke (a type of sandstone)
Sedimentary
Quartz (Iron-stained or Rose variant)
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO₂)
Mineral
Agate
Agate (a cryptocrystalline variety of Quartz, SiO₂)
Mineral
Chert (Iron-stained)
Chert (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Thunderegg (specifically a Jasper/Agate-filled Geode nodule)
Silicon Dioxide (SiO2) within Rhyolitic Matrix
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary