Transparent, tasteless crystals found in nature as agate, amethyst, chalcedony, cristobalite, flint, sand, QUARTZ, and tridymite. The compound is insoluble in water or acids except hydrofluoric acid.
    

concept

A diatom frustule

Diatom frustule, SEM

Radiolaria

Foundation and form in Jungian sandplay : an art therapy approach / Lenore Steinhardt.

Kervran's silica / by Leslie Kenton.

Single grain of sand, SEM

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Silicon Dioxide

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Foundation and form in Jungian sandplay : an art therapy approach / Lenore Steinhardt.

Kervran's silica / by Leslie Kenton.

Single grain of sand, SEM

Diatom frustule, SEM

A diatom frustule