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Barrerite
Current inventory:  0 gems
 

Barrerite

  
Barrerite is n
amed for Richard Maling Barrer (1910-1996), New Zealand-born British teacher and student of the chemistry of Zeolites.

Discovered in 1974;   IMA status: Valid (Approved 1974)

 

Chemistry

 

 

Chemical Formula:

(Na,K,Ca)2Al2Si7O18 Ě 7H2O

 

Hydrated Potassium Sodium Calcium Aluminum Silicate

Molecular Weight:

2,680.57 gm

Composition:

Potassium

1.55 %

K

1.86 %

K2O

 

Sodium

4.67 %

Na

6.30 %

Na2O

 

Calcium

1.26 %

Ca

1.76 %

CaO

 

Magnesium

0.15 %

Mg

0.26 %

MgO

 

Aluminum

8.24 %

Al

15.58 %

Al2O3

 

Iron

0.02 %

Fe

0.03 %

FeO

 

Silicon

23.80 %

Si

50.93 %

SiO2

 

Hydrogen

1.94 %

H

17.33 %

H2O

 

Oxygen

58.36 %

O

 

 

 

 

100.00 %

 

100.00 %

= TOTAL OXIDE

 

 

Classification

   

   

Mineral Classification:

Silicates (Germanates)

Strunz 8th Ed. ID:

8/J.23-40

Nickel-Strunz 10th Ed. ID:

9.GE.15

 

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H
2O; zeolite family
E : Chains of T
10O20 Tetrahedra

Related to:

Zeolite Group. Heulandite - Barium-Brewsterite Series.

Members of Group:

Zeolite Group: Amicite, Barrerite, Bellbergite, Bikitaite, Boggsite, Brewsterite, Chabazite, Chabazite-LÚvyne Subgroup, Clinoptilolite, Cowlesite, Dachiardite-Na, Epistilbite, Erionite, Faujasite Subgroup, Ferrierite, Garronite, Gismondine, Gmelinite, Gobbinsite, Goosecreekite, Harmotome, Heulandite, Laumontite, LÚvyne, Mazzite, Merlinoite, Montesommaite, Mordenite, Offretite, Paulingite, Pollucite, Stellerite, Stilbite, Thomsonite, Tschernichite, Wairakite, Willhendersonite, Yugawaralite

Varieties:

None

Synonyms:

None

 

 

Crystal Data

   

   

Crystallography:

Orthorhombic - Dipyramidal

Crystal Habit:

As well-formed, laminar crystals, to 5 mm, with {010}, {011}, and {111}; {001} is common, but of poor quality.

Twinning:

None

 

 

Physical Properties

   

 

Cleavage:

Perfect on {010}

Fracture:

Irregular/Uneven, Conchoidal

Tenacity:

Brittle

Moh's Hardness:

3.0 - 4.0

Density:

2.13 - 2.30 (g/cm3)

Luminescence:

None

Radioactivity:

Barely Detectable; GRapi = 22.57 (Gamma Ray American Petroleum Institute Units) 

 

 

Optical Properties

   

   

Color:

White, Pink

Transparency:

Transparent, Translucent

Luster:

Vitreous

Refractive Index:

1.479 - 1.489  Biaxial ( - )

Birefringence:

0.010

Dispersion:

None

Pleochroism:

None

 

 

Occurances

   

   

Geological Setting:

On the walls of large fractures in deeply weathered andesitic and rhyolitic lavas.

Common Associations:

Heulandite

Common Impurities:

Fe, Mn, Mg, Sr, Ba

Type Locality:

Near Capo Pula, below South San Efisio Tower, Nora, Margherita di Pula, Cagliari Province, Sardinia, Italy

Year Discovered:

1974 (IMA approved 1974)

View mineral photos:

Barrerite Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


Barrerite is the rarest member of the
Zeolite Group of minerals that includes over 40 minerals and these gem-type minerals: Analcime, Barrerite, Chabazite, Epistilbite, Gmelinite-Na, Goosecreekite, Mordenite, Natrolite, Pollucite, Scolecite, Stellerite, Stilbite, Thomsonite and Yugawaralite. The mineral Barrerite was discovered in 1974 near Capo Pula, Sardinia, Italy. The only current source of gem quality crystals of Barrerite is on the Kuiu Island and Kupreanof Island, Alaska, USA. Gems are usually colorless to very slightly pink and translucent.
 

  
Barrerite
gems for sale:

We have not photographed our Barrerite gems yet. Please check back soon.
 

 


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