Antropogenic (Man Made Glass Byproduct)

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

Polished basalt (vesicular basalt pebble)

Basalt, primarily plagioclase feldspar and pyroxene, commonly with olivine and iron oxides

Pink Granite

Phaneritic Felsic Igneous Rock

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Fluorite

Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Citrine Quartz / Yellow Quartz Pebbles

Silicon Dioxide (SiO2)

Weathered sandstone or iron-stained sedimentary rock

Likely quartz-rich sandstone; exact identification is uncertain from the photograph

Flint or chert nodule

Microcrystalline quartz (chalcedony), SiO₂

Dalmatian jasper

Orbicular rhyolite, commonly marketed as Dalmatian jasper; quartz–feldspar volcanic rock with dark aegirine/arfvedsonite-like inclusions

Peridot (Olivine)

Magnesium Iron Silicate (Mg, Fe)2SiO4

Quartz

Silicon Dioxide (SiO2)

Amethyst

SiO2 (Silicon Dioxide)

Quartzite

Metamorphic Quartzite (SiO2)

Quartzite

Metamorphic Quartzite (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Microcline (Potassium Feldspar)

Microcline (KAlSi3O8)

Milky Quartz Pebble with Iron Inclusions

Silicon Dioxide (SiO2) with iron oxide impurities

Clear Quartz

Silicon Dioxide (SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Quartz (Milky variant)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 based with quartz grains)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Potassium Feldspar

K-Feldspar (KAlSi3O8)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

SiO2 (Silicon Dioxide)

Rose Quartz

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

SiO2 (Silicon Dioxide)

Olivine

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)