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Wednesday, February 17, 2016

TAAF 2016
Titanite



COUNTRY: TAAF
ISSUE DATE: 1 January 2016
STAMP SIZE: 26 x 40 mm
STAMP DESIGN: Claude Perchat



Titanite, or sphene (from the Greek sphenos, meaning wedge), is a calcium titanium nesosilicate mineral, CaTiSiO5. Trace impurities of iron and aluminium are typically present. Also commonly present are rare earth metals including cerium and yttrium, calcium may be partly replaced by thorium.