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Canasite
Current inventory:  0 gems
 

Canasite

  
Canasite is named for its composition: calcium (Ca), sodium (Na) and silicon (Si) - Ca-Na-Si-te. The picture at left shows yellow Canasite associated with purple Charoite, orange
Tinaksite and black Aegirine.

Discovered in 1959;   IMA status: Valid (IMA approved)

 

Chemistry

 

 

Chemical Formula:

Na4K2Ca5Si12O30(OH)3F

 

Sodium Potasium Calcium Silicate Hydroxide Fluoride

Molecular Weight:

1,257.57 gm

Composition:

Potassium

6.22 %

K

7.49 %

K2O

 

Sodium

7.31 %

Na

9.86 %

Na2O

 

Calcium

15.93 %

Ca

22.30 %

CaO

 

Silicon

26.80 %

Si

57.33 %

SiO2

 

Hydrogen

0.24 %

H

2.15 %

H2O

 

Oxygen

41.98 %

O

 

 

 

Fluorine

1.51 %

F

1.51 %

F

 

 %

F

0.64 %

O=F2

 

 

100.00 %

 

100.00 %

= TOTAL OXIDE

 

 

Classification

   

   

Mineral Classification:

Silicates (Germanates)

Strunz 8th Ed. ID:

8/F.35-10

Nickel-Strunz 10th Ed. ID:

9.DG.80

 

9 : SILICATES (Germanates)
D : Inosilicates
G : Inosilicates with 3-periodic single and multiple chains

Related to:

None

Varieties:

None

Synonyms:

None

 

 

Crystal Data

   

   

Crystallography:

Monoclinic - Prismatic

Crystal Habit:

As crystals, to 10 cm; in platy aggregates, to 20 cm; also granular.

Twinning:

Polysynthetic, the twinning plane at an angle of 8 to the less perfect cleavage.

 

 

Physical Properties

   

 

Cleavage:

One, Very Perfect; another, Perfect, at 118 to the first.

Fracture:

Splintery, breaks into long acute-angled or wedge-shaped pieces.

Tenacity:

Brittle

Moh's Hardness:

6.0

Density:

2.707 (g/cm3)

Luminescence:

None

Radioactivity:

Barely Detectable; GRapi = 89.32 (Gamma Ray American Petroleum Institute Units)

 

 

Optical Properties

   

   

Color:

Brownish Yellow, Green Yellow, Light Green

Transparency:

Transparent to Translucent

Luster:

Vitreous

Refractive Index:

1.534 - 1.543  Biaxial ( - )

Birefringence:

0.0090

Dispersion:

Weak; r > v

Pleochroism:

None

 

 

Occurances

   

   

Geological Setting:

In pegmatites in a differentiated alkalic massif (Khibiny massif, Russia); in charoitic rocks (Murun massif, Russia).

Common Associations:

Fenaksite, Lamprophyllite, Titanite, Eudialyte, Nepheline, Pyroxene, Orthoclase (Khibiny massif, Russia); Tinaksite, Miserite, Charoite (Murun massif, Russia).

Common Impurities:

None

Type Locality:

Material'naya Adit, Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia

Year Discovered:

IMA approved 1959

View mineral photos:

Canasite Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


Canasite is a relatively rare mineral that is commonly found as brownish yellow to yellowish green aggregates in Charoite. When contrasted against swirling purple Charoite it makes for beautiful cabochons. The picture above shows yellow Canasite associated with purple Charoite, orange
Tinaksite and black Aegirine. Canasite is extremely rare as a faceted gem.

Canasite is found at only three localities in the world, and all three are in Russia; on Mts. Yukspor and Rasvumchorr, Khibiny massif, Kola Peninsula, and in the Murun massif, southwest of Olekminsk, Yakutia, Russia.
 

  
Tinaksite gems for sale:

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

 


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