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Hydroxylherderite - Dassu, Braldu valley, Gilgit-Baltistan, Pakistan
(#:MINS8880)
Glassy green Herderite crystals on minor matrix in fine condition. The crystals shows sharp edge modifications and striated faces. From a find in 2005, the crystal here is 2,1 cm in diameter and transparent to translucent.
Formula :
CaBe[(F,OH)/PO
4
]
System:
monoclinic
Hardness:
5-5½
Rarity:
not common
Strunz id:VII/B.1-10 - PHOSPHATES, ARSENATES and VANADATES
Name origin:
Named "hydro-herderite" in 1894 by Samuel L. Penfield. Named changed to "hydroxyl-herderite" by Palache, Berman, and Frondel in 1954. Originally named for Siegmund August Wolfgang von Herder (1776-1838), Mining official in Freiberg, Germany. The "Hydroxyl-" prefix signifies the dominance of hydroxide over fluorine.
Specimen weight:15 gr.
Crystal size:Up to 2,1 cm wide
Overall size: 35mm x 27 mm x 25 mm
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2-(MI) - Miniature (Max 5.0 cm)
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