Pink gems are extremely attractive when cut, especially as round brilliants. The hardness makes wear unrecommended; cutting presents no great problems. This is a very rare gemstone, seen only in a few collections.
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
|Crystallography||Monoclinic (pseudo-orthorhombic). Crystals prismatic, often twinned.|
|Colors||Colorless. pale pink, pale yellow, light brown, reddish brown, black.|
|Luster||Vitreous to resinous.|
|Density||3.05 (pure Mn end member); 3.08 (Brazil)|
|Birefringence||0.029-0.035. (Note: less than Childrenite)|
|Cleavage||Poor; fracture uneven to subconchoidal|
|Stone Sizes||Cut eosphorites are always small, usually less than 3-4 carats. Cuttable crystals are usually very small and badly flawed, only from the Brazil localities.|
|Spectral||Strong line at 4100, moderate at 4900 (in brownish-pink material).|
|Pleochroism||Distinct: yellow/pink/pale pink to colorless.|
Series to Childrenite if Fe exceeds Mn.
Optics: a = 1.638-1.639; β= 1.660-1.664; γ = 1.667-1.671.
Biaxial (-), 2V= 50°.
Occurrence: In granite pegmatites, usually associated with Mn phosphates.
Branchville, Connecticut; Maine: Keystone, South Dakota; North Groton, New Hampshire. Hagendorf, Germany
Minas Gerais, Brazil: excellent, flat, pink crystals up to 4 x I cm, at Itinga.
Comments: Pink gems are extremely attractive when cut, especially as round brilliants. The hardness makes wear unrecommended; cutting presents no great problems. This is a very rare gemstone, seen only in a few collections.
Name: From Greek eosphoros, meaning dawn-bearing, in allusion to the pink color.