The Badu Hill Pegmatite, discovered in 1936 by Tillie Badu Moss, is a late-stage hydrothermal pegmatite located about 4 miles southwest of Lake Buchanan, in Llano County. Classified as an NYF or "rare-earth" pegmatite, Badu Hill contains a large number of rare-earth minerals, many of which are radioactive due to the presence of uranium and thorium daughter elements. Large deposits of a dark purple fluorite variety known as chlorophane are found as veins in quartz and feldspar throughout the site. Chlorophane is an extremely rare variety of fluorite that glows with a bright blue-green light when heated (see photo below).
Unique doubly terminated smoky quartz points and scepters up to 5cm can be found in clay-filled pockets along the rim of the pegmatite. Large masses of fluorite, pyrite and rare-earth minerals are found in the Hydrothermally altered zones. A metasomatic skarn at the site has yielded beautiful clusters of spessartine, vesuvianite, wollastonite, grossular and scapolite crystals in dolomitic marble pods. Scheelite is sometimes found in this marble as well.
Badu Hill is a very rugged site and as such is considered hazardous for children under 12 or pets. There are numerous fall and water hazards. In no case will climbing on pit walls or collecting near cliffs be allowed.
Low clearance vehicles are NOT recommended at this site
Low clearance vehicles with 8 inches or less of ground clearance, such as the Mini Cooper or the VW Beetle are likely to high center on the low water crossing on the road to the site. SUV's, mid-size sedans, and standard size passenger vehicles should have no problem negotiating the crossing as long as the creek isn't at flood stage. If you are in doubt, you may park before the crossing and hike the 400 yards to the site.
4 cm pistachio-green wedge of an unusual radioactive anatase after titanite pseudomorph from the Badu Hill Pegmatite
Garnet Found at Badu
June 9, 2013
Purple Fluorite, Pyrite
Thermoluminescent fluorite (chlorophane) emitting blue-green light when heated.
Mindat.org Photo of the Day - 5th Feb 2010
Thermoluminescent dark purple fluorite showing some euhedral faces from the Badu Hill Pegmatite in Llano County, Texas. Fracture and cleavage surfaces are coated with a thin layer of dark red hematite and yellow limonite that exhibits iridescence.
Muscovite Book, Albite