Llallagua, Bustillo Province, Potosi Department, Bolivia.
A pink apatite on a matrix of quartz and siderite, from recent finds in Llallagua, though not at the more prolific Siglo XX Mine which is also on the outskirts of the the mountain town. The 3.5x 3 cm dimension is from the pictured display angle, though it is a little longer so the published dimension may make it seem a bit smaller than it is....
Please note that the color really varies with lighting type-- it will be most saturated under incandescent light, and weakest in sunlight or equivalent lighting.