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 Bedognč coll.
Formula :
(Fe2+,Mg,Mn2+)3[PO4]2 * 4 H2O
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.
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 Specimen weight:18 gr.
 Crystal size:Up to 4 mm
 Overall size: 40mm x 23 mm x 12 mm
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