| 11. | The intense color of azurite makes it a popular collector's stone.
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| 12. | Azurite specimens are typically massive to nodular, and are often stalactitic in form.
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| 13. | The Virgin Mary's azurite blue robe has degraded into a greenish-black.
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| 14. | Azurite is soft, with a Mohs hardness of only 3.5 to 4.
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| 15. | Olivenite, mansfieldite, scorodite, azurite and malachite are found in association with zeunerite.
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| 16. | Azurite, a form of copper carbonate, was often used as a substitute for ultramarine.
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| 17. | They also used less expensive green earth pigment, or mixed yellow ochre and blue azurite.
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| 18. | Furthermore, a figurine depicting them has been carved out of azurite, a blue stone.
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| 19. | Older examples of azurite pigment may show a more greenish tint due to weathering into malachite.
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| 20. | However, gentle heating of azurite produces a deep blue pigment used in Japanese painting techniques.
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