Detailed sheet

hyalophane

Discovered in 1855, it owes its name to the Greek “hyalos” – glass-, and “Phanos” – which has the appearance.



CHEMICAL CHARACTERISTICS

(K,Ba)[Al(Si,Al)3O8]

alumino-silicate



PHYSICAL CHARACTERISTICS

Main color

colourless

Other colors

white, yellow, red

Color of streak

white

Luster

vitreous

Hardness

6.0 to 6.5

Density

2.57 to 2.82

Cleavage

perfect

Fracture

conchoidal, uneven



OPTICAL PROPERTIES

Transparency

translucent, transparent

Refractive index

1.542 - 1.546

Double refraction

0.004

very weak, biaxial (-)

visible double refraction

No

Dispersion

-

Pleochroism

absent

Number of colors

1

Fluorescence

none



CRYSTALS PROPERTIES

prismatic

crystals system

monoclinic



OTHER INFORMATIONS

Exploited
sites

It is found in the United States in California, Pennsylvania, in British Colombia in Canada, in Western Australia and southern China, in Japan.

use in jewelry

collection stone cut in facets

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