- Thompson mine
- Death Valley
- Inyo County
- 4.6 by 4.2 by 3.2 cm – Miniature specimen (fits into a 5 cm cube)
Hydroboracite is a calcium magnesium borate mineral named for its composition (Hess, 1834). The mineral has monoclinic symmetry, and forms subparallel groups of bladed crystals with inclined terminations. This find in Death Valley represents a world class occurrence of the mineral, with individual crystals to 1.6 cm. This is a choice miniature example from the Ordway collection. These came out in the 1970s, and an article appeared in volume 9 (1978) of the Mineralogical Record.
Item code: MS0969
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