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Jeremejevite
Current inventory:  2 gems
 

Jeremejevite

  
Named after P.V. Jeremejev (1830 - 1899), a Russian mineralogist and engineer.

Discovered in 1883;   IMA status:  Valid (pre-IMA; Grandfathered)

 

Chemistry

 

 

Chemical Formula:

Al6B5O15(F,OH)3

 

Aluminum Borate Fluoride Hydroxide

Molecular Weight:

511.93 gm

Composition:

Aluminum

31.62 %

Al

59.75 %

Al2O3

 

Boron

10.56 %

B

34.00 %

B2O3

 

Hydrogen

0.10 %

H

0.88 %

H2O

 

Oxygen

48.44 %

O

 

 

 

Fluorine

9.28 %

F

9.28 %

F

 

 

  - %

F

-3.91 %

 — O=F2

 

 

100.00 %

 

100.00 %

= TOTAL OXIDE

 

 

Classification

   

   

Mineral Classification:

Borates

Strunz 8th Ed. ID:

5/G.05-30

Nickel-Strunz 10th Ed. ID:

6.AB.15

 

6 : BORATES
A : Monoborates
B : BO
3, with additional anions; 1(D) + OH, etc.

Related to:

None

Members of Group:

None

Varieties:

None

Synonyms:

Eremeevite, Eremeyevite, Jeremeievite, Jéréméiéwite, Jeremejeffite, Jeremejewite, Yeremeyevite

 

 

Crystal Data

   

   

Crystallography:

Hexagonal - Dipyramidal

Crystal Habit:

Crystals are typically hexagonal prismatic, may be tapered by vincinal forms, with pyramidal termination, to 10 cm.

Twinning:

None

 

 

Physical Properties

   

 

Cleavage:

None observed

Fracture:

Conchoidal

Tenacity:

Brittle

Moh's Hardness:

6.5 - 7.5

Density:

3.28 - 3.31 (g/cm3)

Luminescence:

None

Radioactivity:

Not Radioactive

Other:

Piezoelectric

 

 

Optical Properties

   

   

Color:

Colorless, pale to dark cornflower Blue, pale Yellowish Brown; Colorless to pale Blue in transmitted light, typically sector zoned.

Transparency:

Transparent

Luster:

Vitreous

Refractive Index:

1.640 - 1.653  Uniaxial ( - ); may be anomalously Biaxial ( – ) in sector-zoned crystals

Birefringence:

0.0130

Dispersion:

Distinct; r > v

Pleochroism:

Light blue/colorless to light yellow

 

 

Occurances

   

   

Geological Setting:

A rare late hydrothermal mineral formed in granitic pegmatites.

Common Associations:

Albite, Tourmaline, Quartz, Gypsum (Cape Cross, Namibia)

Common Impurities:

None

Type Locality:

Soktuj Gora, Adun-Cholon Range, Nertschinsk (Nerchinsk) Mines, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye), Eastern-Siberian Region, Russia

Year Discovered:

1883

View mineral photos:

Jeremejevite Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


Jeremejevite was originally discovered on Mt. Soktui in Russia as minute crystals not large enough for faceting. More recent finds at "Mile 72" near Khan River, north of Swakopmund, Namibia and the Eifel district in Germany have yielded beautiful pale blue crystals. The crystals are elongated and very small. Therefore, gems are small and usually faceted in an elongated emerald or baguette cut. Faceted Jeremejevite is extremely rare because most sources have produced little material or are mined out. Jeremejevite is also
piezoelectric.

Jeremejevite is found at only a few localities. From Mt. Soktui, Nerschinsk district, Adun-Chilon Mountains, Siberia, Russia. In the Kukurt massif, Pamir Mountains, Tajikistan. Relatively large crystals have been found at a prospect near Cape Cross, at Mile 72, about 100 km north of Swakopmund, and from Ameib, Erongo Mountains, Namibia. At Wannerköpfe and Emmelberg, near Üdersdorf, Eifel district, Germany.
 

  
Jeremejevite gems for sale:

Jeremejevite-002

Gem:

Jeremejevite

Stock #:

JERE-001

Weight:

0.5065 ct

Size:

5.93 x 3.46 x 2.38 mm

Shape:

Baguette

Color:

Very, Very Light Blue

Clarity:

SI - I

Origin:

Erongo Mtn., Namibia

Treatment:

None (natural)

Price:

$190.00    [ Make an offer ]

Pictures are of the actual gem offered for sale.
Gem images are magnified to show detail.

Jeremejevite-002

This rare gem is from the Erongo Mountains of Namibia. It is a very pale blue (almost colorless).


Jeremejevite-001

Gem:

Jeremejevite

Stock #:

JERE-002

Weight:

0.026 ct

Size:

2.02 x 1.50 x 1.06 mm

Shape:

Baguette

Color:

Light Blue

Clarity:

VVS2

Origin:

Erongo Mtn., Namibia

Treatment:

None (natural)

Price:

SOLD  (but we have others)

Pictures are of the actual gem offered for sale.
Gem images are magnified to show detail.

Jeremejevite-001

This rare gem is from the Erongo Mountains of Namibia. It is a very pale blue and very slightly included.


Jeremejevite-003

Gem:

Jeremejevite

Stock #:

JERE-003

Weight:

0.0590 ct

Size:

3.88 x 1.48 x 1.08 mm

Shape:

Baguette

Color:

Light Blue

Clarity:

Eye Clean

Origin:

Erongo Mtn., Namibia

Treatment:

None (natural)

Price:

SOLD  (but we have others)

Pictures are of the actual gem offered for sale.
Gem images are magnified to show detail.

Jeremejevite-003

This rare gem is from the Erongo Mountains of Namibia. It is a very pale blue (almost colorless).


Jeremejevite-004

Gem:

Jeremejevite

Stock #:

JERE-004

Weight:

0.0305 ct

Size:

2.66 x 1.46 x 0.97 mm

Shape:

Baguette

Color:

Blue

Clarity:

Eye Clean

Origin:

Erongo Mtn., Namibia

Treatment:

None (natural)

Price:

SOLD  (but we have others)

Pictures are of the actual gem offered for sale.
Gem images are magnified to show detail.

Jeremejevite-004

This rare gem is from the Erongo Mountains of Namibia. It is a very nice blue.


 


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