These two aluminium sulfates are just a few mm wide, but beautiful under magnification. The white tuft is Pickeringite, a magnesium aluminium sulfate, sitting on a bed of dark green Voltaite, potassium iron aluminim sulfate. From Grotta dell'Allume, Porto Levante, Sicily, Italy.
A real good time was had by all creating this collection of fantasy crystal photographs - fantasy crystals in many different colors and shapes. My personal favourites are the two crystal altar images and the crystal sacrifice :-)