This is a colour mutation of Grenache or Garnacha as the variety should be called given its Spanish origin.
It is grown extensively in Southern France and in Spain. It is a minor variety in California and South Africa. Only small amounts are grown elsewhere.
Technically Grenache Blanc is not a separate variety. It is genetically identical to Grenache except for a small mutation affecting the colour of the grapes. There is also another mutation Grenache Gris - the grey or pink version.
However, for all practical purposes, it is treated as a separate variety. Grenache Blanc is most often used as an ingredient of blended whites, but it also makes attractive varietal wines, both dry and sweet.
There are only a few producers In Australia (thus far) who are making wine from this variety so it is included in my Rare Ozzies book.
However there seems to quite a buzz around for red Grenache at the moment and some of that enthusiasm my rub off onto Grenache Blanc.
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