Igneous Or Metamorphic

Quartz vein rock (milky quartz)

Milky quartz, SiO₂; likely quartz-rich vein material in altered host rock

Magnetite

Magnetite (Fe3O4)

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Milky quartz fragment

Quartz (silicon dioxide, SiO₂), likely massive or vein quartz

Milky quartz (quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Green aventurine (tumbled)

Quartz-rich aventurine; predominantly microcrystalline SiO₂ with fuchsite mica inclusions

Muscovite Mica

Muscovite / KAl2(AlSi3O10)(OH)2

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Tumbled quartz pebble (probable)

Quartz, silicon dioxide (SiO₂), possibly milky quartz or quartz-rich river stone

Rock crystal (clear quartz)

Quartz, silicon dioxide (SiO₂), likely milky/included quartz

Milky quartz pebble

Quartz (SiO₂), commonly called milky quartz

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely faceted colorless gemstone

Probable quartz (rock crystal), SiO₂; diamond or topaz cannot be excluded from the photograph

Quartz with Host Rock

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Rounded quartz-rich pebble

Likely microcrystalline quartz (chalcedony), possibly a weathered quartz or feldspar pebble

Milky quartz

Quartz, silicon dioxide (SiO₂)

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Milky quartz pendant

Quartz (silicon dioxide, SiO₂)

Raw Citrine (Yellow Quartz)

Citrine / Silicon Dioxide (SiO2)

Milky quartz

Quartz (SiO₂), commonly called milky quartz

White quartz-rich rock, possibly milky quartz

Quartz (SiO₂), likely massive milky quartz; identification is uncertain from the image

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Quartz cluster

Quartz (silicon dioxide, SiO₂), likely milky quartz

Tumbled magnetite-rich rock

Magnetite (Fe₃O₄), likely in a mafic-rock matrix

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Quartz vein with iron staining and dark sulfide/oxide minerals

Quartz (SiO₂), with probable iron oxides and unidentified dark sulfides

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz with iron-oxide staining

Quartz, silicon dioxide (SiO₂)

Milky quartz (probable)

Quartz, silicon dioxide (SiO₂)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Possible hematite- or magnetite-rich rock

Likely iron oxide, chiefly hematite (Fe₂O₃) and/or magnetite (Fe₃O₄); exact identification requires testing

Milky quartz

Quartz (silicon dioxide, SiO₂)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Green Quartz (Prasiolite or Aventurine)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with natural radiation treatment

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)