Moonstone (Tumbled)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Albite
mineral
Category
Mineral Specimen
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Sandstone
Arenite (SiO2 based with mineral cements)
sedimentary
Rose Quartz
Silicon dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Polished agate/jasper nodule
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide impurities
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzite-rich Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Quartz (White/Milky Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Tourmalinated Quartz
Silicon dioxide (SiO2) with inclusions of Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Rough Quartz (Smoky or Citrine variant)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Galena
Galena (lead sulfide, PbS)
mineral
Quartz-rich rock fragment
Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia
mineral
Tiger's Eye (with Hematite/Jasper)
SiO2 (Silicon Dioxide) with Fe2O3 (Hematite)
mineralogical
Quartz-veined Limestone
Sedimentary limestone with quartz/calcite veinlets
sedimentary
Tiger's Eye
SiO2 (Quartz pseudomorph after crocidolite)
gemstone
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Geode (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Mixed tumbled stone collection
Assorted minerals, likely including quartz, jasper, agate, and possibly obsidian or hematite
mineral
Quartz with Hematite
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)
mineral
River Cobble (Quartz-rich Sandstone)
Arenite with iron oxide staining
sedimentary
Moonstone
Orthoclase feldspar (KAlSi3O8)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate Geode with Quartz
Silicon Dioxide (SiO2)
mineral
Rounded pink granite pebble
Granite, chiefly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende
igneous
Limonite with Galena
FeO(OH)·nH2O (Limonite) and PbS (Galena)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chert (and Chert Breccia)
Silicon Dioxide (SiO2)
sedimentary
Sandstone Pebble (River Rock)
Arenite (primarily SiO2)
sedimentary
Muscovite Mica in Quartz
Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Basalt (with possible Calcite/Quartz veining)
Afanitic Mafic Igneous Rock
igneous
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzite Pebble)
Arenite (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
sedimentary