hydroxylherderite
Detailed sheet
hydroxylherderite
Its name honors Siegmund August Wolfgang von Herder (1776-1838) who identified it.
It is found associated with herderite, besides many specimens called herderite are actually of hydroxylherderite.
CHEMICAL CHARACTERISTICS
CaBe(PO4)(OH)
beryllium calcium phosphate
PHYSICAL CHARACTERISTICS
Main color
yellow
Other colors
white, blue, grey, colourless, green
Color of streak
white
Luster
vitreous
Hardness
5.0 to 5.5
Density
2.95 to 0.00
Cleavage
indistinct
Fracture
conchoidal
OPTICAL PROPERTIES
Transparency
translucent, transparent
Refractive index
1.601 - 1.631
Double refraction
0.030
definite, biaxial (-)
visible double refraction
Yes
Dispersion
-
Pleochroism
absent
Number of colors
1
Fluorescence
weak
yellow
CRYSTALS PROPERTIES
prismatic
crystals system
monoclinic
OTHER INFORMATIONS
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Beautiful crystals come from Brazil, Paraiba, Conselheiro Pena, from Skardu in Pakistan, the United States.
use in jewelry
cut in facets it’s a collection stone
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