Minerals

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General Information

Lapis Lazuli

Lapis Lazuli is no mineraal, but a type of rock. It consists of many different types of minerals, like: lazurite (25-40%), silicates, calcite, sodalite, pyrite and some others.[1]

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Chemical & Physical Information

Trivial NameLapis Lazuli
Chemical Name-
Chemical Formula-
Density2,7-2,9 g·cm-3
Molar mass-
Hardness5-5,5
Crytal systemNone
Unit cell-
Crystal habit-
FractureUneven, conchoidal
CleavageNone
ColourBleu, purple
LusterDull
StreakLight Bleu
OpacityOpaque
SafetySafe
ExtraUsed as the blue pigment ultramarine.
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Photos

Lapis Lazuli

(3 cm)

Lapis Lazuli

(1 cm)

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Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.