|
Search Results - gemstones, August 2006
your search of 'gemstones, August 2006' has 1 result.
15/09/2009
Coral is a stone of organic origin, composed almost wholly of calcium
carbonate with about three per cent magnesium carbonate and possibly a
trace of iron oxide. It is generally expressed as being the axial
skeleton of coral polyps.
Read more »
|
|
|
|
|