Quartz pebble / River stone
SiO2 (Silicon Dioxide)
mineral
Category
Igneous And Metamorphic
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Pyrite-bearing Rock
Iron Sulfide (FeS2) associated with host rock
mineral
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Black Tourmaline
Schorl (NaFe3Al6(Si6O18)(BO3)3(OH)4)
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Moonstone
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
gemstone
Amethyst
Silicon dioxide (Quartz), SiO2
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Biotite mica
Biotite, a potassium-rich mica in the annite–phlogopite series; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Biotite mica (likely)
Biotite, a mica-group mineral; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Sand Grain
Silicon Dioxide (SiO2)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
gemstone
Likely clear quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Clear quartz (rock crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Biotite (Black Mica)
Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2
mineral
Tumbled Moonstone
Feldspar (Orthoclase/Albite), KAlSi3O8
mineral
Likely quartz pebble or quartz fragment
Quartz, SiO₂ (identification from the photo is tentative)
mineral
Likely rough quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Moonstone
Orthoclase Feldspar ((Na,K)AlSi3O8)
mineral
Biotite
K(Mg,Fe)3AlSi3O10(OH)2
mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Rainbow Moonstone
White Labradorite (Plagioclase Feldspar), (Na,Ca)(Al,Si)4O8
gemstone
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Blue Quartz (Dumortierite Quartz)
SiO2 with inclusion of AlAl6BSi3O18
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Citrine
Silicon Dioxide (SiO2) with ferric iron impurities
gemstone
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Likely feldspar (weathered, cleaved fragment)
Probably potassium feldspar, KAlSi₃O₈ (orthoclase or microcline); identification from the photo is provisional.
mineral
Moonstone (with Tourmaline/Mica)
Orthoclase/Albite Feldspar (KAlSi3O8 / NaAlSi3O8)
mineral
Biotite (Black Mica)
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary