Quartz with Mafic Inclusions
Silicon Dioxide (SiO2) with host igneous matrix
igneous
Category
Sedimentary Or Igneous (Host Environment)
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Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Chrysotile Serpentine (Asbestos in Matrix)
Chrysotile Mg3Si2O5(OH)4
metamorphic
Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone
Undetermined; likely iron oxides/hydroxides (goethite–hematite–limonite) in a silicate host
mineral
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz Vein in Basalt
Silica-infilled basaltic host rock
igneous
Red Jasper (Amygdaloidal Basalt with Agate)
Silicon dioxide (SiO2) in Basalt host
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz Crystal on Matrix
Silicon Dioxide (SiO2)
mineral
Chert / Flint Nodule
Microcrystalline quartz (SiO2)
sedimentary
Greenstone (Altered Mafic Rock)
Greenschist / Meta-basalt
metamorphic
Yellow Chalcedony (Carnelian/Yellow Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Dendritic Agate or Manganese Nodule in Chert/Limestone
Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions
sedimentary
Sandstone Concretion
Clastic Sedimentary Concretion (primarily SiO2 with Fe2O3 cement)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Common variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide) - SiO2 with Iron impurities
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Quartz Geode or Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Ptygmatic Migmatite
Migmatite (consisting of Neosome and Paleosome fractions)
metamorphic
Granite Pebble
Granite
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock)
igneous
River Pebbles (Tumbled Quartz and Basalt)
Silicon Dioxide (SiO2) for white quartz; Mafic Volcanic Rock for basalt
igneous and sedimentary
Quartz Geode
Crystalline Quartz (SiO2) within a sedimentary or volcanic host
mineral
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Quartz in Matrix (possibly with Biotite or Hornblende)
Quartz (Silicon Dioxide, SiO2) in Granitic Matrix
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Granite Pebble
Granite
igneous
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Chert (Chert Nodule with Chalky Cortex)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Crystal Geode / Druzy Cluster
Silicon Dioxide (SiO2)
mineral
Carnelian (Chalcedony)
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral