Ferruginous Quartzite (Red Quartzite)
Quartzite (primarily SiO2 with Fe2O3 inclusions)
metamorphic
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
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Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Granite
Granite (Phaneritic Igneous Rock)
igneous
Banded gneiss, probably granitic gneiss
Foliated gneiss composed mainly of quartz (SiO₂), feldspar—orthoclase/microcline and plagioclase—and dark mica, commonly biotite K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
metamorphic
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Basalt River Cobble
Basalt (Aphanitic extrusive mafic igneous rock)
igneous
Epidote with Quartz
Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)
mineral
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Epidote
Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Chlorite (Small Flakes/Sand)
Chlorite Group (Magnesium Iron Aluminum Silicate Hydroxide - (Mg,Fe)3(Si,Al)4O10(OH)2·(Mg,Fe)3(OH)6)
mineral
Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Muscovite (Mica)
Muscovite - KAl2(AlSi3O10)(OH)2
Mineral
Tumbled Yellow Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive Igneous Rock
igneous
Basalt Pebble
Extrusive igneous rock
igneous
Basalt with Phenocrysts
Extrusive Igneous Rock
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Basalt (Polished)
Extrusive mafic igneous rock
igneous
Granite River Rock
Phaneritic Felsic Igneous Rock (Granite)
igneous
River Pebble (Granite/Gneiss)
Granitic Pebble / Quartz-Feldspar Aggregate
igneous
Schist
Crystalline Metamorphic Rock (Schistose)
metamorphic
Grey Quartz (likely Smoky Quartz or Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble (with Quartz Vein)
Meta-quartzite (SiO2-dominated metamorphic rock)
metamorphic
Granite / Quartz Vein Rock
Granitoid with Quartz (SiO2)
igneous
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Granite Cobble
Granite (Phaneritic Quartz-Feldspar Felsic Rock)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Faceted Gemstone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Granite Cobble / Gneiss (River Rock)
Granitic Gneiss / Felsic Igneous Rock
igneous
Mica-rich Schist fragment
Mica Schist
metamorphic
Mica (Biotite or Phlogopite variety)
Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)
mineral
River Stone (likely Quartzite or Limestone)
Silicon dioxide (SiO2) or Calcium carbonate (CaCO3)
metamorphic
Quartz with Mica (Muscovite or Biotite)
Silicon Dioxide (SiO2) with Phyllosilicates
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Quartz with Muscovite Mica
SiO2 with KAl2(AlSi3O10)(OH)2
mineral group
Basalt
Extrusive Igneous Rock
igneous
Quartzite with Iron Staining
Metamorphic Quartzite (SiO2)
metamorphic