Detailed sheet

herderite

Its name honors the German mining engineer von Herder (1776-1838).



CHEMICAL CHARACTERISTICS

Ca,Be[PO4](F,OH)

basic calcium phosphate



PHYSICAL CHARACTERISTICS

Main color

colourless

Other colors

blue, grey, yellow, green

pale color shades

Color of streak

white

Luster

vitreous

Hardness

5.0 to 5.5

Density

2.95 to 3.05

Cleavage

indistinct

Fracture

conchoidal

conchoidal



OPTICAL PROPERTIES

Transparency

translucent, transparent

Refractive index

1.586 - 1.625

Double refraction

0.023

definite, biaxial (-)

visible double refraction

Yes

Dispersion

0,017(0.008)

Pleochroism

absent

Number of colors

1

Fluorescence

none



CRYSTALS PROPERTIES

prismatic

crystals system

monoclinic



OTHER INFORMATIONS

Exploited
sites

It occurs in beautiful crystals in Brazil (Paraiba, Governador Valadares), China (Jiangxi), Germany (Bavaria), England (Cornwall) United States (Maine, North Carolina, San Diego, California).

use in jewelry

it is cut in facets. It is a collection stone

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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