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Ludlamite - Blackbird Mine, Blackbird mine complex, Blackbird Mining District, Lemhi Co., Idaho, USA
(#:MINS8447)
This fine specimen is from the premier US locality for ludlamite, the Blackbird Mine of Idaho. The matrix plate is covered with intergrown, gemmy, olive-green crystals to 4 mm across. They have superb euhedral form, are translucent and sharp. Ludlamite from this locale is world-known as among the best crystals of the species for those characteristics.Ex Francesco Bedognè coll.
Formula :
(Fe
2+
,Mg,Mn
2+
)
3
[PO
4
]
2
* 4 H
2
O
System:
monoclinic
Hardness:
3½
Rarity:
not common
Strunz id:VII/C.10-10 - PHOSPHATES, ARSENATES and VANADATES
Name origin:
For Henry Ludlam (1824-1880), English mineral collector, London, England.
Specimen weight:18 gr.
Crystal size:Up to 4 mm
Overall size: 40mm x 23 mm x 12 mm
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