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| Poudretteite was named
to honor the Poudrette family, operators of the Poudrette quarry,
Mont Sainte-Hilaire, Quebec,
Canada where the material was discovered.
| Discovered
in 1987;
IMA
status:
Valid (IMA approved
1987) |
|
Chemistry
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Chemical
Formula: |
KNa2B3SI12O30
|
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Potassium
Sodium Boron Silicate |
Molecular
Weight: |
912.90 gm
|
Composition: |
Potassium |
4.28 % |
K |
5.16 % |
K2O |
|
Sodium |
5.04 % |
Na |
6.79 % |
Na2O |
|
Silicon |
36.92 % |
Si |
78.98 % |
SiO2 |
|
Boron |
1.18 % |
B |
3.81 % |
B2O3 |
|
Oxygen |
52.58 % |
O |
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|
|
100.00 % |
|
94.74 % |
= TOTAL OXIDE |
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Classification
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Mineral
Classification: |
Silicates
(Germanates)
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Strunz 8th
Ed. ID:
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8/E.22-10
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Nickel-Strunz 10th
Ed. ID:
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9.CM.05
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9 : SILICATES (Germanates)
C : Cyclosilicates M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
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Related
to: |
Osumilite (Milarite)
Group.
|
Members
of Group: |
Osumilite (Milarite)
Group: Almarudite, Armenite, Berezanskite, Brannockite,
Darapiosite, Dusmatovite, Friedrichbeckeite, Klöchite,
Merrihueite, Milarite, Osumilite, Osumilite-(Mg), Poudretteite,
Roedderite, Shibkovite, Sogdianite, Sugilite, Trattnerite,
Yagiite
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Varieties: |
None
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Synonyms: |
IMA1986-028
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Crystal
Data
|
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Crystallography:
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Hexagonal
- Dihexagonal Dipyramidal
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Crystal
Habit:
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As
roughly equant, barrel-shaped prismatic crystals, deeply
etched, to 5 mm.
|
Twinning:
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None
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Physical
Properties
|
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Cleavage: |
None
observed
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Fracture: |
Splintery
to Conchoidal
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Tenacity:
|
Brittle
|
Moh's
Hardness: |
5.0 - 6.0
|
Density:
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2.51 (g/cm3)
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Luminescence:
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None
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Radioactivity:
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Barely
Detectable,
GRapi = 61.48
(Gamma Ray American Petroleum Institute Units)
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Optical
Properties
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Color: |
Colorless to pale pink
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Transparency: |
Transparent
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Luster: |
Vitreous
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Refractive
Index: |
1.516 - 1.532 Uniaxial ( +
)
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Birefringence: |
0.0160 - 0.0210
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Dispersion: |
n/a
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Pleochroism: |
n/a
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Occurances
|
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Geological
Setting: |
In
marble xenoliths within nepheline syenite breccias in
an intrusive alkalic gabbro-syenite complex. |
Common
Associations: |
Pectolite,
Apophyllite, Aegirine
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Common
Impurities: |
None
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Type
Locality: |
Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy
quarry), Mont Saint-Hilaire, Rouville Co., Québec, Canada |
Year
Discovered: |
1987
(IMA approved
1987) |
View
mineral photos: |
Poudretteite
Mineral Photos and Locations |
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More
Information
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|
Mindat.org
Webmineral.com
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|
|
Poudretteite is one of the rarest gems
on Earth. It was discovered in the Poudrette quarry,
Mont Sainte-Hilaire, Quebec, Canada in 1987 and more
recently in 2000 in the Mogok Valley in upper Myanmar
(Burma). Until the recent find in Mogok, only very tiny
crystals were found at Mont Sainte-Hilaire, not large
enough to be faceted. The first Mogok find initially resulted in
less than a dozen faceted gems. A pale pink and colorless crystal
was found that was originally identified as Scapolite
but was later identified as a new discovery of Poudretteite.
Poudretteite is a member of the Osumilite (Milarite)
Group of minerals that includes Milarite,
Poudretteite,
Sogdianite and
Sugilite.
Poudretteite is found as colorless and pale pink to pink.
|
Poudretteite
gems for sale:
|
Gem:
|
Poudretteite |
Stock
#:
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POUD-001 |
Weight:
|
0.0050
ct |
Size: |
1.60
x 0.78 mm |
Shape: |
Round |
Color: |
Very
Pale Pink |
Clarity: |
Eye
clean |
Origin: |
Mogok, Myanmar
(Burma) |
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 extemely
rare gem is from a recent find in Mogok, Burma. Poudretteite
is considered to be one of the ten rarest gemstones in the
world according to curiousnotions.com.
|
|
Gem:
|
Poudretteite |
Stock
#:
|
POUD-002 |
Weight:
|
0.0715
ct |
Size: |
4.18
x 2.21 x 1.62 mm |
Shape: |
Marquise |
Color: |
Colorless |
Clarity: |
Eye
clean |
Origin: |
Mogok, Myanmar
(Burma) |
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 extemely
rare gem is from a recent find in Mogok, Burma. Poudretteite
is considered to be one of the ten rarest gemstones in the
world according to curiousnotions.com.
|
|
Gem:
|
Poudretteite |
Stock
#:
|
POUD-003 |
Weight:
|
0.0670
ct |
Size: |
4.69
x 2.07 x 1.41 mm |
Shape: |
Marquise |
Color: |
Light
Pink |
Clarity: |
Eye
clean |
Origin: |
Mogok, Myanmar
(Burma) |
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 extemely
rare gem is from a recent find in Mogok, Burma. Poudretteite
is considered to be one of the ten rarest gemstones in the
world according to curiousnotions.com.
|
|
Gem:
|
Poudretteite |
Stock
#:
|
POUD-004 |
Weight:
|
0.0300
ct |
Size: |
2.01
x 1.99 x 1.27 mm |
Shape: |
Square |
Color: |
Very
Pale Pink, Colorless |
Clarity: |
Eye
clean |
Origin: |
Mogok, Myanmar
(Burma) |
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 extemely
rare gem is from a recent find in Mogok, Burma. Poudretteite
is considered to be one of the ten rarest gemstones in the
world according to curiousnotions.com.
|
|
|