Wilkeite Value, Price, and Jewelry Information

Rob Lavinsky, iRocks.com – CC-BY-SA-3.0 [CC-BY-SA-3.0], via Wikimedia Commons

Wilkeite

An overview on Wilkeite Jewelry and Gemstones. Covers details and essential information on the physical properties and characteristics of Wilkeite gems.

Wilkeite Information

Data Value
Name Wilkeite
Is a Variety of Apatite
Colors Pale pinkish, yellowish, rose red.
Crystallography Hexagonal. Crystals rounded; granular; massive.
Refractive Index 1.636-1.650
Luster Vitreous to resinous.
Hardness 5
Specific Gravity 3.12-3.23
Birefringence 0.010
Cleavage Imperfect
Stone Sizes Cuttable crystal fragments have been encountered, but I know of no faceted gems.
Luminescence None reported.
Luminescence Present No
Transparency Transparent to translucent.
Absorption Spectrum Not diagnostic.
Formula

Ca5(SiO4PO4SO4)3(O,OH,F).

Optics

o = 1.640-1.650; e = 1.636-1.646. Uniaxial (-).

Optic Sign Uniaxial -

Apatite Group.

Occurrence: In metamorphosed marbles.

Kyshtym, Urals, USSR; Laacher See, Germany.

Crestmore, California in marble.

Comments: Wilkeite is a rare silicate—sulfate apatite that has not been encountered as faceted gems; however. I have seen cuttable crystals that would yield stones in the 1-5 carat range. These would be extremely rare stones.

Name: After R. M. Wilke, mineral collector and dealer in Palo Alto, California.