Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Category
Igneous Or Metamorphic
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Quartz pebble / River stone
SiO2 (Silicon Dioxide)
mineral
Quartz (Agate/Jasper pebble)
Silicon Dioxide (SiO2)
mineral
Pyrite Nodules / Weathered Pyrite
Iron Sulfide (FeS2)
mineral
Aventurine (likely Green Aventurine)
Silicon Dioxide (SiO2) with mineral inclusions
Mineral/Mineraloid within a rock matrix
Smoky Quartz
Quartz (SiO₂)
Mineral
Common Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
gemstone
Milky Quartz with Iron Staining
Quartz (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
gemstone
Strawberry Quartz (Aventurine)
Silicon Dioxide with Hematite/Lepidocrocite inclusions (SiO2)
mineral
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Mineral
Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Sunstone Quartz / Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Amethyst Geode/Cluster
Quartz (SiO2) - variety Amethyst
Mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Iron-Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Quartz (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Labradorite
(Na, Ca)(Si, Al)4O8
mineral
Amethyst
SiO2 (Silicon Dioxide with Iron impurities)
mineral
Biotite on Quartz
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2) and Quartz (SiO2)
mineral
Quartz (Gravel Pebble)
Silicon Dioxide (SiO2)
sedimentary
Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
Quartz Pebble (with Feldspar/Mica)
Granitic Quartz / SiO2 with KAlSi3O8
igneous
Quartz (Smoky/Brown variety)
Silicon dioxide (SiO2)
mineral
Moonstone
Orthoclase (KAlSi3O8) or Oligoclase with adularescence
gemstone
Hematite
Iron Oxide (Fe2O3)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Quartz
Silicon dioxide (SiO2) with inclusions
mineral
Specular Hematite
Hematite (Fe2O3)
mineral
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with trace Iron (Fe)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary