Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Category
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Limonite (Ironstone Concretion)
Limonite: FeO(OH)·nH2O
sedimentary
Druzy Quartz on Chert/Siltstone
Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix
sedimentary
Septarian Nodule
Septarian Concretion (CaCO3 with Siderite/Limonite streaks)
sedimentary
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Milky Quartz (Quartz Vein)
Silicon Dioxide (SiO2)
mineral
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Basalt with Secondary Mineral Infillings
igneous
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Vesicular Basalt with Epidote
Vesicular Basalt (Mg, Fe)2SiO4 with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
igneous
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Quartz Pebble (with Iron Staining)
Crystalline Silicon Dioxide (SiO2)
mineral
Agate Geode
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Epidote
Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Sandstone
Arenite
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
Fluorite on Matrix
Calcium Fluoride (CaF2)
mineral
Granitic Pegmatite
Pegmatitic Granite
igneous
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Basalt (Amygdaloidal)
Amygdaloidal Basalt
igneous
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Quartz Geode
Quartz (Silicon Dioxide, SiO2) in a Geode
sedimentary
Agate Geode with Quartz Druzy
Chalcedony (SiO2) and Quartz (SiO2)
mineral
Limonite Concretion
Limonite (FeO(OH)·nH2O) Pseudomorph
sedimentary