Hurlbutite Value, Price, and Jewelry Information

Hurlbutite Value

The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.

Hurlbutite Information

Crystallography Orthorhombic; crystals prismatic, chunky, with etched surfaces and striations.
Colors Colorless to greenish white; may be stained yellow. Streak: white.
Luster Vitreous to greasy.
Fracture Conchoidal; brittle.
Hardness 6
Specific Gravity 2.88.
Birefringence 0.009.
Cleavage None.
Stone SizesThis is an extremely rare mineral, and small clean cuttable fragments have yielded minute faceted stones. They are transparent and colorless, all under 1 carat in size.
Luminescence None reported.
Spectral Not diagnostic.
Pleochroism None.  

Optics:  a = 1.595; β= 1.601; γ= 1.604.

Biaxial (-).

Occurrence: In pegmatite with muscovite, albite, and other minerals at the Smith Mine, Chandlers Mill, Newport, New Hampshire.

Name: After Cornelius Hurlbut, well-known professor of mineralogy at Harvard University.