Ulexite after Borax
- Kramer deposit
- Kern County
- 3.7 by 3.5 by 3.2 cm – Miniature specimen (fits into a 5 cm cube)
Ulexite is a complex sodium calcium borate mineral with triclinic symmetry. The name honors Georg Ludwig Ulex (1811-1883), a nineteenth century German chemist. Ulexite typically forms fine needles and fibrous masses, and specimens are rather difficult to find. This is an unusual example of ulexite forming a pseudomorph after a borax crystal. Borax dehydrates to tincalconite in air, and this example has a white powdery core of that mineral. Fine grained ulexite forms a thick porcelain like growth over the crystal cluster. An interesting pseudomorph!
Item code: MS0957
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