Hureaulite

Often found with Zircon, xenotime is a term used to describe a group of earthy minerals, but it's mostly used as the name for the most common member of the group, , Xenotime-(Y). This mineral is a source of yttrium, a chemical element used to make lasers. Xenotime may contain certain radioactive elements, therefore it can have low to mild radioactivity.

Phosgenite is a rare, lead-containing mineral that forms lustrous, angular crystals. Though most specimens are colorless or pale yellow-brown, rare individuals may take on hues varying from pale green to light pink to violet-grey. The crystals exhibit fluorescence, glowing when exposed to certain lights. Phosgenite has few commercial or industrial uses, though outstanding crystal formations are highly sought-after by collectors.

Augelite is a rare mineral that is semi-transparent and may take on several hues, ranging from blue to pink to green or colorless. Augelite crystals may be large enough to cut gemstones out of, but because the stone is both soft and brittle, it is rarely of interest to anyone beyond collectors.

Proustite appears near the top of many gem collectors' "must-have" lists. It is very difficult to come across a specimen that is gallery grade. Less attractive pieces are mined and smelted for their high levels of silver. It is one of the very few transparent crystals to contain this element!

Ferberite is a variety of Wolframite and is only separated from the rest of the family by its high iron concentrations. Surprisingly, its appearance lacks the classical coloration of other minerals with similar iron content. It is mined as an ore of tungsten, and collectible crystal specimens aren't common to come by.

Wardite is a rare and fairly obscure mineral that may be found in hues ranging from blue to green to milky to colorless. Because its crystals tend to take on a rare form (they are tetragonal trapezohedral), this mineral is often sought after by collectors. Soft and brittle, it is rarely cut into gemstones.

Powellite is an unusual, molybdenum-containing mineral that appears in a variety of colors, though it is most commonly whitish or yellowish. The mineral was discovered in Idaho in the 1890s and was named for John Wesley Powell, a famed geologist and explorer who spent much time delving into the mineralogy and geology of the American west. Powellite is not used industrially or commercially, though some exceptionally-colored specimens may be sought after by collectors.

Pectolite is a unique material known for its unusual crystals that form extremely slender fibers radiating from the central point outwards. This crystal habit makes the material very delicate and fragile — it can be easily broken and dented when touched. Pectolite is highly after by collectors, particularly the blue variety called larimar.