Jeremejevite | Gemopedia

Jeremejevite was named for a Russian mineralogist in 1883, but there are rarely any specimens found in Russia today. Recently Namibia has started to produce some mentionable crystals, but in such small amounts the stone is still very rare. Jeremejevite is typically found in pale blue-green, cornflower-blue to yellowish brown hues.
Colors
Blue-Green, Cornflower Blue, Brown, Pale Yellow, Colorless

Jeremejevite Classification

Common Name

Jeremejevite

Species

Jeremejevite

Variety

Colors

Blue-Green, Cornflower Blue, Brown, Pale Yellow, Colorless

Alternate Names

Gemstone Groups

Key Separations

RI, birefringence and possible optic character.

Comments

Jeremejevite is a composite mineral with a uniaxial hexagonal outer zone and a biaxial monoclinic core.Piezoelectric: development of opposite charges at the ends of the crystal when placed under stress.

Jeremejevite Optical Properties

Transparency

Transparent

Refractive Index

1.64-1.651
Tolerance:(+0.002/-0.001)

Birefringence

0.009

Optic Character

Uniaxial and Biaxial

Optic Sign

Negative

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Dichroic, strong blue and near colorless

Dispersion

Comments

Jeremejevite Chemistry & Crystallography

Chemical Name

aluminum borate fluoride hydroxide

Chemical Formula

Al6B5O15(F,OH)3

Synthesis

Crystal System

Hexagonal

Classification

Borate

Nature

Natural

Crystallinity

Crystalline

Comments

Jeremejevite Characteristic Physical Properties

Hardness

6.5-7.5

Streak

White

Specific Gravity

3.27-3.31

Toughness

Poor

Inclusions

Jeremejevite often shows banding or growth related color zoning and occasionally step-like growth zoning that looks like lightning bolts. Stones can have natural inclusions, fingerprints and healing feathers.

Luster

Vitreous

Stability

Fracture

Conchoidal

Cleavage

None

Comments

JTV on Google+
0 Items
My Wish List
Close
Item
Description
Qty.
Price


Estimated Order Total:
0
Total Due Today:
0
Close
Item
Description
Qty.
Price


Page of 1