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Volkonskoite 10g

SKU: NAP-420-2501
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Description
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A chromium-bearing mineral that is part of the smectite group, volkonskoite is a clay mineral found in sandstones, conglomerates, and red beds, commonly filling voids from the decomposition of organic material. The largest deposit of volkonskoite is found in Mt. Efimiatsk and elsewhere in the Okhansk region, Middle Kama River area, Perm Basin, Ural Mountains, Russia. We get our pigment from mineral sources near the village of Efimiata in the Perm Basin. The pigment was named for Prince A. Volkonskoi, Minister of the Imperial Court, Russia, in the 19th century. Its masstone varies from olive green to bright emerald green. Ours is a deep forest green edging towards an olive green. Usually the mineral is free from impurities and is ready for use as a pigment without much preparation.

Pigment Names
Common Names: English: volkonskoite
French: 
German:
Italian: 
Spanish:
Synonyms: English:
French:
German:
Italian:
Alternate Names: Wolchonskoite



Origin and History
There is little known about the use of this pigment in ancient art. There is some evidence of a green chromium oxide pigment in some European works from the Renaissance. Pablo Picasso especially liked this pigment, which he imported from the former Soviet Union.

Source
Ural Mountains, Russia

Permanence and Compatibility
Volkonskoite is considered to be a permanent pigment. It is unaffected by exposure to light. There are no known incompatibilities with other pigments and paint binders.

Oil Absorption and Grinding: 

No data has been published on the oil absorption properties of volkonskoite. A unique characteristic of the mineral volkonskoite is its high adhesive property, which complicates pulverizing it for use as a pigment. One method to eliminate this difficulty is to add a small amount of quartz to volkonskoite while grinding or mulling the mineral. The addition of quartz does not detract from its qualities as one of best green pigments to use in glazes. 

Toxicity
Volkonskoite is somewhat toxic and care should be used in handling the dry powder pigment so as not to inhale its dust.


Pigment: Volkonskoite

Pigment Information
Color: Green
Colour Index: Not Listed
Chemical Name: Copper Carbonate Hydroxide
Chemical Formula: Ca0,3(Cr+3,Mg,Fe+3)2(Si,Al)4O10(OH)2*4H2O
ASTM Lightfastness Rating
Acrylic: I
Oil: I
Watercolor: I
Properties
Density: 2
Hardness: 2-2.5
Refractive Index:  


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