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| Named after P.V. Jeremejev (1830 - 1899),
a Russian mineralogist and engineer.
| Discovered
in 1883;
IMA
status:
Valid (pre-IMA; Grandfathered) |
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Chemistry
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Chemical
Formula: |
Al6B5O15(F,OH)3
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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 |
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|
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Fluorine |
9.28 % |
F |
9.28 % |
F |
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|
- % |
F |
-3.91 % |
—
O=F2 |
|
|
100.00 % |
|
100.00 % |
= TOTAL OXIDE |
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Classification
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Mineral
Classification: |
Borates
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Strunz 8th
Ed. ID:
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5/G.05-30
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Nickel-Strunz 10th
Ed. ID:
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6.AB.15
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6 : BORATES
A : Monoborates B : BO3, with additional anions; 1(D) + OH, etc.
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Related
to: |
None
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Members
of Group: |
None
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Varieties: |
None
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Synonyms: |
Eremeevite,
Eremeyevite, Jeremeievite, Jéréméiéwite, Jeremejeffite,
Jeremejewite, Yeremeyevite
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Crystal
Data
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Crystallography:
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Hexagonal
- Dipyramidal
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Crystal
Habit:
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Crystals
are typically hexagonal prismatic, may be tapered by
vincinal forms, with pyramidal termination, to 10 cm.
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Twinning:
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None
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Physical
Properties
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Cleavage: |
None
observed
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Fracture: |
Conchoidal
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Tenacity:
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Brittle
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Moh's
Hardness: |
6.5
- 7.5
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Density:
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3.28 - 3.31 (g/cm3)
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Luminescence:
|
None
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Radioactivity:
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Not
Radioactive
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Other: |
Piezoelectric
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Optical
Properties
|
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Color: |
Colorless,
pale to dark cornflower Blue, pale Yellowish Brown;
Colorless
to pale Blue in transmitted light, typically sector
zoned.
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Transparency: |
Transparent
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Luster: |
Vitreous
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Refractive
Index: |
1.640
- 1.653 Uniaxial ( - ); may be anomalously Biaxial
( – ) in sector-zoned crystals
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Birefringence: |
0.0130
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Dispersion: |
Distinct;
r > v
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Pleochroism: |
Light blue/colorless
to light yellow
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Occurances
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Geological
Setting: |
A
rare late hydrothermal mineral formed in granitic pegmatites.
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Common
Associations: |
Albite,
Tourmaline, Quartz, Gypsum (Cape Cross, Namibia)
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Common
Impurities: |
None
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Type
Locality: |
Soktuj Gora, Adun-Cholon Range, Nertschinsk (Nerchinsk)
Mines, Buriatia (Buryatia) Republic, Transbaikalia (Zabaykalye),
Eastern-Siberian Region, Russia |
Year
Discovered: |
1883
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View
mineral photos: |
Jeremejevite
Mineral Photos and Locations |
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More
Information
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|
Mindat.org
Webmineral.com
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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:
|
Gem:
|
Jeremejevite |
Stock
#:
|
JERE-001 |
Weight:
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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. |
|
|
This
rare gem is from the
Erongo Mountains of Namibia.
It is a very pale blue (almost colorless).
|
|
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. |
|
|
This
rare gem is from the
Erongo Mountains of Namibia.
It is a very pale blue and very slightly included.
|
|
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. |
|
|
This
rare gem is from the
Erongo Mountains of Namibia.
It is a very pale blue (almost colorless).
|
|
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. |
|
|
This
rare gem is from the
Erongo Mountains of Namibia.
It is a very nice blue.
|
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