Hureaulite can show rich and lively pink, rose, and orange colors. However, this collector's gem is rarely cut.
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
|Crystallography||Monoclinic. Crystals prismatic up to 3 cm, tabular; massive; compact.|
|Colors||Pale rose, violet-rose, yellowish, red-orange, orange-red, brownish orange, yellowish to reddish brown, gray, colorless.|
|Luster||Vitreous to greasy.|
|Cleavage||Good 1 direction.|
|Transparency||Transparent to translucent|
|Formula||Mn5(PO4)2[(PO3)(OH)]2 · 4H2O.|
|Pleochroism||Colorless/pale rose to yellow/reddish yellow-brown.|
|Optics||a = 1.637-1.652; β = 1.645-1.658; γ = 1.649-1.663. Biaxial ( - ), 2V= 75°.|
|Etymology||After the type locality, Les Hureaux, France.|
|Occurrence||In phosphate masses in granite pegmatites.|
The hureaulite mineral group encompasses this manganese phosphate material as well as chongite, miguelromeroite, nyholmite, sainfeldite, and villyaellenite. Researchers have determined that a red mineral formerly known as palaite from Pala, California is only a variety of hureaulite.
Although gem-quality crystals are rare, many sites worldwide produce this mineral.
Notable gem-quality sources include:
- United States: Pala, California (orange masses); Branchville, Connecticut; North Groton, New Hampshire; South Dakota.
- Brazil; Haute Vienne, France; Germany; Poland; Portugal.
To date, no faceted gems are known. However, facetable material likely exists. One day, adventurous gem cutters will try their hands at it.
You’re more likely to find hureaulites, if at all, in mineral collections than in jewelry collections. Jewelry use isn’t recommended.
Avoid exposing this very soluble material to any solutions containing acids.
Consult our Gemstone Jewelry Cleaning Guide for care recommendations.