Eosphorite Value, Price, and Jewelry Information


Eosphorite
By Modris Baum (http://www.mindat.org/photo-199422.html) [Public domain], via Wikimedia Commons

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.

Eosphorite Value

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Eosphorite Information

DataValue
NameEosphorite
Crystallography Monoclinic (pseudo-orthorhombic). Crystals prismatic, often twinned.
Colors Colorless. pale pink, pale yellow, light brown, reddish brown, black.
Luster Vitreous to resinous.
Fracture Uneven to subconchoidal.
Hardness 5
Specific Gravity 3.05 (pure Mn end member); 3.08 (Brazil).
Birefringence 0.029-0.035. (Note: less than Childrenite)
Cleavage Poor.
Stone SizesCut eosphorites are always small, usually less than 3-4 carats. Cuttable crystals are usually very small and badly flawed, only from the Brazil localities.
Luminescence None observed.
Spectral Strong line at 4100, moderate at 4900 (in brownish-pink material).
Formula(Mn,Fe)AIPO4(OH)2· H20.
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.