Hurlbutite Value
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Hurlbutite Information
| Data | Value |
| Name | Hurlbutite |
| 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. |
| Hardness | 6 |
| Density | 2.88. |
| Birefringence | 0.009. |
| Cleavage | None; fracture conchoidal; brittle. |
| Stone Sizes | This 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. |
| Formula | CaBe2(PO4)2. |
| 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.
