Detailed sheet

neptunite

Discovered by the mineralogist Flink in 1893, it was named Neptune, the God of the Sea for the Romans, as it was discovered on the same site, in association with aegirine, the scandinavian name of the God of the sea



CHEMICAL CHARACTERISTICS

KNa2Li(Fe,Mn)2Ti2[Si8O24]

manganese and iron alkaline titanosilicate



PHYSICAL CHARACTERISTICS

Main color

black

Other colors

brown, red

very dark

Color of streak

brown

Luster

vitreous

Hardness

5.0 to 6.0

Density

3.19 to 3.25

Cleavage

perfect

Fracture

conchoidal



OPTICAL PROPERTIES

Transparency

opaque, translucent

very rarely transparent

Refractive index

1.690 - 1.735

Double refraction

0.028

difficult to observe biaxial positive

visible double refraction

No

Dispersion

++

Pleochroism

definite

Number of colors

2

yellow, orange red

Fluorescence

none



CRYSTALS PROPERTIES

prismatic

crystals system

monoclinic



OTHER INFORMATIONS

Exploited
sites

It is found associated with benitoite, in San Benito, California and other deposits in the United States and Canada. It is present in Brazil, Russia, Mongolia, Tajikistan, Australia, Ireland, Greenland.

use in jewelry

often of a very dark color, it is cut in facets. It’s a collection stone

Other
Gems

Venez visitez

notre site web

voillot-joaillier.fr

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