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Natural Pigments Riebeckite Net Vol 4 oz - Color: Dark Blue

SKU : NAP-410-2210
The minimum order amount for this product line is $30.00
Natural Pigments Riebeckite Net Vol 4 oz - Color: Dark Blue
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 1   US$ 19.69 
Price: US$ 19.69
Quantity: Out of stock

Product description

Riebeckite is a dark blue mineral from deposits in Krivoi Rog, Ukraine. It has been identified on wall paintings in Late Neolithic and Bronze Age Europe and the eastern Mediterranean.

Pigment Names
Synonyms: Abriachanit, Abriachanita, Orthoriebeckit, Orthoriebeckita, Orthoriebeckite, Osanit, Osanita, Osanite, Osannit, Osannita, Osannite, Riebeckit, Riebeckita
Alternate Names: English: blue amphibole, blue asbestos, blue Cape asbestos, Crocidolite (variety)

Origin and History
Riebeckite is a not well-known dark blue mineral although most people have probably seen stones that at one time were composed of riebeckite crystals. The mineral was named after a famous 18th-century German explorer and mineralogist, Emil Riebeck (1853-1885). The mineral was identified on wall paintings on Crete (Knossos, Ayia Triada, Amnissos), mainland Greece (Mycenae) and Cyprus (Akrotiri and Thera), and other works of art since Late Neolithic times (at least the 4th millennium B.C.E.) and the Early Bronze Age, where its was used alone and in combination with Egyptian blue (a synthetic blue pigment).

Riebeckite is a natural silicate mineral belonging to the amphibole group with notable occurrences in Soqotra, South Yemen; Transvaal, South Africa; Schirmeck, Germany; Langesund, Norway; Krivoi Rog, Ukraine; Western Australia; Scotland; Madagascar; and the USA. Rublev riebeckite pigment is made from deposits in Krivoi Rog, Ukraine. Some forms of riebeckite are asbestiform and can be used as asbestos. Asbestos has many industrial uses despite some health risks and is made of different minerals all with a fibrous habit. Riebeckite has a variety called “crocidolite” that is asbestiform in habit, which is the mineral variety of the Rublev pigment.

Permanence and Compatibility
Riebeckite is not affected by light and is stable under normal atmosphere. It is resistant to alkalis and hence can be used in fresco and casein.

Oil Absorption and Grinding
Riebeckite absorbs a moderate amount of oil (20 g oil per 100 g of pigment).

Riebeckite is an asbestiform mineral and is rated toxic, especially with prolonged exposure by inhalation. It is not considered toxic in contact with the skin. Asbestos is a known carcinogen. Care should be used in handling the dry powder pigment to avoid breathing the dust. A NIOSH-certified dust mask should be worn.

Pigment: Riebeckite
Pigment Information
Color: Dark Blue
Colour Index: -
Chemical Name: Sodium Iron Magnesium Silicate Hydroxide
Chemical Formula: Na2(Fe, Mg)3Fe2Si8O22(OH)2
ASTM Lightfastness Rating
Acrylic: Not Tested
Oil: Not Tested
Watercolor: Not Tested
Specific Gravity: 3.2–3.4 (3.2 g/cm3)
Hardness: 5–6
Refractive Index: a=1.68-1.698, b=1.683-1.7, g=1.685-1.706
Oil Absorption: 20 g oil/100 g pigment

California Proposition 65: This product contains a chemical known to the State of California to cause cancer and birth defects or other reproductive harm.

Natural Pigments

Natural Pigments is a limited liability company based in Willits, California. We manufacture and distribute rare and hard-to-find materials for fine artists and decorators. We specialize in supplying artists' materials that were used in historical painting since pre-historic times up to and including the nineteenth century.

We constantly search for materials and products of the finest quality so that we can bring them direct to you from the source. To do so, we travel the world to find materials specifically for use by professional artists and decorators. We obtain minerals from mines in Afghanistan, Chile, Russia, Ukraine and Uzbekistan, to name a few places, processing these into natural pigments. We purchase resins, gums and plants from India, Kenya and Malaysia to make natural varnishes and painting mediums.

Our mission is to provide the largest variety of natural pigments, paints and other professional artists' supplies, enabling us to bring you a selection that makes shopping for rare and hard-to-find art materials easy. Our objective is to promote the education and use of these materials among artists by providing detailed information for their employment in encaustic, fresco, oil, watercolor and tempera painting.
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This product is shipped from our warehouse in Gretna, NE, USA.
This product is brand new and includes the manufacturer's warranty, so you can buy with confidence.
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Pigment: Riebeckite

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