The phosphate deposit at Mansfield is of low grade and was difficult to concentrate, resulting in closure of the State Run Mine some 40-50 years ago. The trenches and phosphate deposits are still exposed at Phosphate Hill. Much of the calcareous material has been altered to phosphate rock and a variety of phosphate minerals also occur. Most of the minerals and crystals are very small, but occasional larger specimens can be found. The phosphate minerals include wavellite, variscite and turquoise.
Turquoise occurs as small, blue transparent crystals and as thin opaque turquoise veins.
There are also green and bluish variscite coatings and veins and greenish wavellite radiating and globular clusters. Most of the specimens at Mansfield are very small. A number of other localities around Victoria are also rich in phosphate minerals. Not all of them occur in phosphate enriched shales, although this is the most widespread type of occurrence. Lake Boga Granite Quarry is notable for it's beautiful apatite crystals and Wannon Falls, near Apollo Bay has beautiful vesuvianite crystals.