Cut childrenite is a great rarity, and all gems are small. Cut eosphorite is more abundantly available, though both materials are very scarce.
The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
|Crystallography||Orthorhombic. Crystals equant, pyramidal, platy, often doubly terminated.|
|Colors||Brown to yellowish brown, golden yellow.|
|Luster||Vitreous to resinous.|
|Density||3.2 (pure Fe end member).|
|Cleavage||Poor. Fracture uneven to subconchoidal.|
|Stone Sizes||Childrenite occurs in brown, opaque crystals up to several inches long. Transparent material is much smaller, and facetable crystals yield stones up to about 3-4 carats. In general, cuttable material in this series is closer to the eosphorite end. Devonian Group (Calgary, Alberta, Canada): 3.58 (Brazil).|
|Spectral||May show lines of iron spectrum.|
|Formula||(Fe,Mn)AIPO4(OH)2 · H2O|
|Pleochroism||Distinct: yellow/pink/colorless to pale pink.|
Series to Eosphorite if Mn exceeds Fe.
OPTICS: a = 1.63-1.645; β = 1.65-1.68; γ = 1.66-1.685. Biaxial (-), 2V= 40-45°.
OCCURRENCE: In granite pegmatites and hydrothermal vein deposits.
Cornwall, England; Greifenstein Germany; Custer, South Dakota.
Minas Gerais, Brazil: gemmy crystals. These are found to be Fe: Mn = 1:1 and could be called childro-eosphorite.
COMMENTS: Cut childrenite is a great rarity, and all gems are small. Cut eosphorite is more abundantly available, though both materials are very scarce.
NAME: J. G. Children, English mineralogist.