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Charoite
Current inventory:  0 gems
 

Charoite

  
Charoite was named for the Chara River, Russia, near which it was discovered.

Discovered in 1947 ;   IMA status: Valid (IMA approved 1987)

 

Chemistry

 

 

Chemical Formula:

K(Ca,Na)2Si4O10(OH,F) H2O

 

Hydrated Potassium Calcium Sodium Silicate Hydroxide Fluoride

Molecular Weight:

1,828.68 gm

Composition:

Potassium

10.69 %

K

12.88 %

K2O

 

Calcium

17.53 %

Ca

24.53 %

CaO

 

Silicon

27.65 %

Si

59.14 %

SiO2

 

Hydrogen

0.39 %

H

3.45 %

H2O

 

Oxygen

43.75 %

O

 

 

 

 

100.00 %

 

100.00 %

= TOTAL OXIDE

 

 

Classification

   

   

Mineral Classification:

Silicates (Germanates)

Strunz 8th Ed. ID:

8/F.35-50

Nickel-Strunz 10th Ed. ID:

9.DG.92

 

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

Related to:

n/a

Varieties:

None

Synonyms:

Charoite Jade, IMA1977-019

 

 

Crystal Data

   

   

Crystallography:

Monoclinic - Prismatic

Crystal Habit:

Fibrous, massive

Twinning:

None

 

 

Physical Properties

   

 

Cleavage:

Good in three directions

Fracture:

Conchoidal

Tenacity:

Brittle

Moh's Hardness:

5.0 - 6.0; VHN50=412 (kg/mm2)

Density:

2.54 - 2.58 (g/cm3)

Luminescence:

Weakly Fluorescent; pale blue under SW UV and LV UV; yellow-orange cathodoluminescence

Radioactivity:

Barely Detectable, GRapi = 10.69 (Gamma Ray American Petroleum Institute Units)

Optical Properties

   

   

Color:

Shades of lilac, violet and purple; colorless in thin section

Transparency:

Semitransparent to Opaque

Luster:

Vitreous to Pearly

Refractive Index:

1.550 - 1.559  Biaxial ( + )

Birefringence:

0.0090

Dispersion:

n/a

Pleochroism:

X = rose; Z = colorless, in thick fragments

 

 

Occurances

   

   

Geological Setting:

In potassic feldspar metasomatites at the contact of nepheline and aegirine syenites with limestones.

Common Associations:

Canasite, Tinaksite

Common Impurities:

Al, Fe, Mn, Sr, Ba

Type Locality:

Murunskyi Massif, Chara River (Charo River), Davan, Torgo River Basin, Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia

Year Discovered:

1947; IMA approved 1987

View mineral photos:

Charoite Mineral Photos and Locations

 

 

More Information

   

   

 

Mindat.org
Webmineral.com

 

 


Charoite is found only in the Murun Massif, Chara River area of the Torgo River Basin, Aldan Shield, Southwest Yakutia (Sakha Republic), Eastern-Siberian Region, Russia. It was discovered in 1947, but was not introduced to the outside world until about 1978. This beautiful mineral has swirling colors of violet, purple and lavender and occassionally swirls of white Feldspar, yellow
Canasite, orange Tinaksite and black Aegirine mixed in. Some specimens are beautifully chatoyant. The mineral is a massive material suitable for making large objects such as bookends and vases and also cabochons. Cabochons look alive with swirling colors and chatoyance. The look of Charoite is unlike any other mineral.

Charoite is named for the Chara River, Russia, near which it was discovered. However, I have heard that the name comes from the Russian word "chary" which means "charms" or "magic" due to its beautiful chatoyance.
 

  
Charoite gems for sale:

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