Dark glauconite, mineral, russian pigment

•Chemical formula: (K,Na)(Fe3+,Al,Mg)₂(Si,Al)₄O₁₀(OH)₂

• Lightfastness – 8

•Alkali resistance:5

•Resistance to limescale:5

•Resistance to acids:5

•Color Index PG23

•Applicability Acrylic, Fresco, Ceramic, Oil, Tempera, Watercolour/Gouache

•Dark green colour

Glauconite is also often present in the sankir layers of ancient Russian icons. As a rule, trees, architecture and earthly images are painted with glauconite. The glauconite pigment is one of the most durable; it does not alter over time, is not subject to external influences and can be used in any mixture. When applied in a thin layer, glauconite is transparent and is used for glazes. To achieve coverage, it is placed in several layers. Chemical description: Mineral, hydrated aluminosilicate of iron, silica and potassium oxide of variable composition, it belongs to the hydromic group. Lightfastness: 8