Sandstone
Arenite (SiO2 predominantly)
sedimentary
Category
Man Made Glass
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Sandstone (Quartz-rich)
Arenite
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily Quartz, SiO2)
sedimentary
Quartz (Smoky/Milky variant)
Silicon Dioxide (SiO2)
mineral
Chert (Flint Pebbles)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Feldspar (Orthoclase)
Potassium Feldspar (KAlSi3O8)
mineral
Sand Grain (Quartz)
Silicon Dioxide (SiO2)
sedimentary
Quartz (Milky/Iron-stained)
Silicon Dioxide (SiO2)
mineral
Quartz (Drusy/Crystalline)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Rose Quartz
SiO2 (Crystalline Quartz with trace inclusions)
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Granite
Felsic Intrusive Igneous Rock
igneous
Granite
Phaneritic plutonic felsic rock
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Peridot (Olivine)
Olivine, (Mg, Fe)2SiO4
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite
Calcium fluoride (CaF2)
mineral
Sandstone (Greywacke)
Clastic Sedimentary Rock (SiO2 with lithic fragments)
sedimentary
Iron Slag
Anthropogenic Ferro-silicate
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Milky Quartz Mineral
Quartz (Silicon Dioxide, SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Mixed Quartz and River Pebbles (Stone Collection)
Mixed assortment containing mainly Silicon Dioxide (SiO2)
igneous, sedimentary, metamorphic, and mineral
Amethyst Geode
Silicon Dioxide (SiO2) with iron impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
River Quartz / Quartzite Pebbles
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Olivine (Peridot)
Olivine (Mg, Fe)2SiO4
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Rose Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Agate/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Granite
Felsic Plutonic Rock (Granite)
igneous