Displaying font awesome Zoom Icon WC 3.0.3

Hello,

Can someone please tell me how I can get the font awesome zoom icon to display on the main product image, rather than the black CSS icon? WooCommerce seems to have given us the CSS for 3 different types of icon in WooCommerce 3.0 (for the zoom image trigger), but only the black CSS icon shows as default.

I have font awesome installed with my theme, but no idea how I can remove the default icon, so that the font awesome icon displays.

Help greatly apprecited!