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Poudretteite
Current inventory:  0 gems
 

Poudretteite

  
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

 

 

Chemical Formula:

KNa2B3SI12O30

 

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

 

 

 

 

100.00 %

 

94.74 %

= TOTAL OXIDE

 

 

Classification

   

   

Mineral Classification:

Silicates (Germanates)

Strunz 8th Ed. ID:

8/E.22-10

Nickel-Strunz 10th Ed. ID:

9.CM.05

 

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si
6O18]12- 6-membered double rings (sechser-Doppelringe)

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

Varieties:

None

Synonyms:

IMA1986-028

 

 

Crystal Data

   

   

Crystallography:

Hexagonal - Dihexagonal Dipyramidal

Crystal Habit:

As roughly equant, barrel-shaped prismatic crystals, deeply etched, to 5 mm.

Twinning:

None

 

 

Physical Properties

   

 

Cleavage:

None observed

Fracture:

Splintery to Conchoidal

Tenacity:

Brittle

Moh's Hardness:

5.0 - 6.0

Density:

2.51 (g/cm3)

Luminescence:

None

Radioactivity:

Barely Detectable, GRapi = 61.48 (Gamma Ray American Petroleum Institute Units)

 

 

Optical Properties

   

   

Color:

Colorless to pale pink

Transparency:

Transparent

Luster:

Vitreous

Refractive Index:

1.516 - 1.532  Uniaxial ( + )

Birefringence:

0.0160 - 0.0210

Dispersion:

n/a

Pleochroism:

n/a

 

 

Occurances

   

   

Geological Setting:

In marble xenoliths within nepheline syenite breccias in an intrusive alkalic gabbro-syenite complex.

Common Associations:

Pectolite, Apophyllite, Aegirine

Common Impurities:

None

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

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


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:

Poudretteite-001

Gem:

Poudretteite

Stock #:

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.

Poudretteite-001

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.


Poudretteite-002

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.

Poudretteite-002

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.


Poudretteite-003

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.

Poudretteite-003

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.


Poudretteite-004

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.

Poudretteite-004

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.


 


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