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Violet Grey Lalvarit Pigment

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453-15

Violet Grey Lalvarit (or lalvarite) is a type of andesite rock that originates from lava flows. This igneous rock is grey but due to iron and manganese oxide impurities, it has a unique violet tint.

Details

Violet Grey Lalvarit (or lalvarite) is an andesite rock originating from lava flows. This igneous rock is grey, but it has a unique violet tint due to iron and manganese oxide impurities.

Pigment Information
Color:	Gray
Pigment Classification:	Natural Inorganic
Colour Index:	N/A
Chemical Name:	N/A
Chemical Formula:	N/A
CAS No.:	N/A
Series No.:	4
ASTM Lightfastness
Acrylic:	N/A
Oil:	N/A
Watercolor:	N/A
Physical Properties (mineral)
Particle Size (mean):	8 μ
Particle Size Range:	<0–15 μ: 80–85% 16–29μ: 15–20% >30μ: 0.1% maximum
Mohs Hardness:	7
Oil Absorption:	32 grams oil / 100 grams pigment
Composition:	Silica (SiO₂): 30.26% Aluminum (Al₂O₃): 8.17% Iron (Fe₂O₃): 5.89% Potassium (K₂O): 1.59% Manganese (Mg): 1.17%
Health and Safety	No acute or known chronic health hazards are associated with this product’s anticipated use (most chemicals are not thoroughly tested for chronic toxicity). Protect yourself against potentially unknown chronic hazards of this and other chemical products by keeping them out of your body. Do this by avoiding ingestion, excessive skin contact, and inhaling spraying mists, sanding dust, and vapors from heating. Conforms to ASTM D-4236.

For a detailed explanation of the terms in the table above, please visit Composition and Permanence.

Origin and History

Lalvarit (or lalvarite from Russian Лалварит) is not a mineral name recognized by any official organization. Due to the uniqueness of the rocks of the Alaverdi ore region, referred to as “Ringing tuffs,” their limited distribution, and the absence of similar formations both outside the region and in Armenia as a whole, it is expedient to call them lalvarit—one of the formations found in the large volcanic structure of Mount Lalvar. These rocks are andesite in composition characterized by great freshness in appearance, which can be easily distinguished from all volcanic rocks of the region.

Andesite is an extrusive volcanic rock of intermediate composition between basalt and rhyolite. Andesite is a fine-grained igneous rock that is intermediate in its silica content and low in alkali metals. It is usually grey in appearance and composed of large amounts of silica.

Source

Violet Grey Lalvarit is from deposits in the Lori Province of Armenia, from lava flows of the Alaverdi ore region near Mount Lalvar.

Mineral Names

Nomenclature (primary mineral):

Common Name	Primary Mineral	Source
Lalvarit	Lalvarit	Lori Province, Armenia

Permanence and Compatibility

Based on the colorants, iron and manganese oxides, this pigment has broad compatibility and permanence with all media. Iron and manganese oxides are very lightfast and stable outdoors and have excellent weatherfastness.

Oil Absorption and Grinding

The oil absorption value for Violet Grey Lalvarit is 32. This means 32 grams or milliliters (approx.) of linseed oil is required to form a coherent paste for every 100 grams of pigment. Violet Grey Lalvarit has a Mohs hardness of 4, which gives it the same abrasiveness as marble. This pigment is easy to grind into both waterborne and oil paint.