Detailed sheet

ludlamite

identified by the English Henry Ludlam ( 1824 – 1880 )



CHEMICAL CHARACTERISTICS

(Fe,Mg,Mn)[PO4]2 - 4H2O

hydrated iron phosphate, magnesium and manganese



PHYSICAL CHARACTERISTICS

Main color

green

Other colors

colourless

apple green shades

Color of streak

white

Luster

pearly, vitreous

Hardness

3.0 to 4.0

Density

3.10 to 3.20

Cleavage

perfect

Fracture

conchoidal, uneven

pearly on the cleavage



OPTICAL PROPERTIES

Transparency

translucent

Refractive index

1.650 - 1.698

Double refraction

0.038

definite, biaxial (+)

visible double refraction

No

Dispersion

+

Pleochroism

absent

Number of colors

1

Fluorescence

none



CRYSTALS PROPERTIES

Thick prisms often biterminals when well crystallized

crystals system

monoclinic



OTHER INFORMATIONS

Exploited
sites

It is found in Bolivia, the United States (New Hampshire, California, New Mexico, South Dakota), Switzerland (Ticino), Portugal, England (Cornwall), Germany (Bavaria).

use in jewelry

collection stone, very rarely transparent

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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