Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous Matrix
metamorphic
Category
Industrial Byproduct (Anthropogenic Rock)
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Quartzite
Quartzite (SiO2)
metamorphic
Banded Agate
Agate (Microcrystalline Chalcedony/Quartz, SiO2)
mineral
Likely weathered quartz-bearing rock fragment
Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite
mineral
Feldspar (Granite Pegmatite matrix)
Potassium Feldspar (KAlSi3O8) / Quartz Mixture
igneous
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Quartzite River Rock
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sulfur (in host rock)
Native Sulfur (S8)
mineral
Sandstone with Foliose Lichen
Arenite (Rock matrix) with Xanthoparmelia or Flavoparmelia (Lichen genus)
sedimentary
Diamond (Cut Specimen)
Diamond (pure carbon, C)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Slate
Slate (Metamorphic Rock)
metamorphic
Jasper (Iron-stained Chalcedony)
SiO2 with Fe2O3 (Iron Oxide) impurities
Sedimentary / Mineral (Silica)
Siltstone or Fine-grained Sandstone pebble
Siltstone (primarily SiO2 with clay minerals)
sedimentary
Fluorite (often referred to as Rainbow Fluorite)
Fluorite (Calcium Fluoride, CaF2)
mineral
Schist
Mica Schist
metamorphic
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Pumice
Pumice (a highly vesicular extrusive volcanic rock)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Serpentine
Serpentinite (complex of Mg, Fe, Ni, Al, Zn, Mn)Si2O5(OH)4
metamorphic
Diamond
Diamond (Pure Carbon, C)
mineral
Gold-bearing Quartz
Auriferous Quartz (SiO2 with Native Gold inclusion)
mineral
Tumbled greenish jasper
Jasper, microcrystalline quartz (SiO₂) with iron-bearing and clay-mineral impurities
metamorphic
Garnet in Matrix (likely Almandine in Quartz/Mica Schist)
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock
metamorphic
Polished dendritic jasper or agate slab
Microcrystalline quartz (SiO₂), likely jasper with chalcedony and iron/manganese dendrites
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Quartz with Mica and Feldspar
Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)
igneous
Chert (Nodule)
Chert (Silica, SiO2)
sedimentary
Basalt (Water-worn pebble)
Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)
igneous
Peridotite
Peridotite (varieties include Dunite, Lherzolite, Harzburgite)
igneous
Polished orbicular jasper
Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions
sedimentary
Citrine (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (SiO2 percentage between 45% and 52%)
igneous
Quartzite
Metamorphic Rock (Quartzite), primarily SiO2
metamorphic
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Granite Glacial Erratic
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Granite
Granite (phaneritic intrusive felsic igneous rock)
igneous
Blue glass-like tumbled specimen
Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic