Lapis lazuli facts for kids

Kids Encyclopedia Facts
Lapis lazuli
Lapis lazuli block.jpg
A polished specimen of lapis lazuli.
General
Category Rock
Formula
(repeating unit)
mixture of minerals
Identification
Color Blue, mottled with white calcite and brassy pyrite
Mohs scale hardness 5–5.5
Luster dull
Streak light blue
Specific gravity 2.7–2.9
Refractive index 1.5
Other characteristics The variations in composition cause a wide variation in the above values.
Lapis-lazuli hg
Lapis lazuli specimen (rough), Afghanistan

Lapis lazuli is a mineral, and a gemstone. It is formed as a metamorphic rock of the limestone type.

Lapis is famous for its beautiful blue colour: its name means "stone of blue". Lapis Lazuli has been used for many things. Its has been made into beads and used in jewellery since Prehistoric times. It can be carved into statuettes (little sculptures). The major use was as a pigment (colour) in artists' paint. During Medieval and Renaissance times, lapis was ground into powder, and mixed with oil. It was used as the colour for painting the sky, and blue clothes. It can be seen in the fresco paintings of Giotto and the tempera paintings of Fra Angelico.

Alternatives

Lapis lazuli is commercially "synthesized" (actually simulated) by a chemical process, using artificial ultramarine and hydrous zinc phosphates. There are also various substitutes for lapis.

Images for kids


Lapis lazuli Facts for Kids. Kiddle Encyclopedia.