1) In Ultramarin, Lapiz Lazuli, can there be
traces found of Baryte(Barium)?
2) In smalt (ground blue glass), can there be
traces found of Baryte(Barium)?
3) Why does the paint or color iron gallus ink
fade after the years. Because of oxidation of the
iron, which would make it brown?
Many thanks |
Answer 1:
Ultramarin contains sodium, aluminum, silicon,
oxygen, and small amounts of sulfur - no barium.
Lazurite, the main constituent of lapiz lazuli, is
made of the same elements. None of the other
common minerals in lapiz lazuli are barium ores
either, although like any rock type lapiz lazuli
could contain small quantities of minerals that
are, as well as trace amounts of barium within the
chemical structure of the minerals that it is made
out of.
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