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Hydroxylherderite - Santa Rosa mine, Itambacuri, Doce valley, Minas Gerais, Brazil
(#:MINS7360)
Glassy slightly translucent yellowish Hydroxylherderite crystal measuring 2,3 cm across is set nicely on matrix with Quartz xl in association.
Ex. W. Pinch collection.
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:65 gr.
Crystal size:2,3 cm across
Overall size: 50mm x 30 mm x 45 mm
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