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Haüyne is valued significantly higher than lapis lazuli, but it is rarely found in jewelry quality suitable for cutting. Azurite or copper azure is much less often used as an ornamental stone due to its fragility and chemical instability, but this mineral has been known since ancient times as a pigment for blue tempera paint, mainly in icon ...
Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.
Lapis lazuli (the pigment ultramarine) was chiefly supplied from Afghanistan during the Middle Ages, whereas azurite was a common mineral in Europe at the time. Sizable deposits were found near Lyons, France. It was mined since the 12th century in Saxony, in the silver mines located there. [17]
Lazurite and hauyne seem to have the same structure and both are sulfate-dominant minerals. [13] Lazurite is a pigment (opalescent) and has a bright blue streak (especially as a component of the semiprecious stone lapis lazuli). Many hauynes have a white or pale blue streak and are translucent.
Hauyne or haüyne, also called hauynite or haüynite (/ ɑː ˈ w iː n aɪ t / ah-WEE-nyte), [7] old name Azure spar, [8]: 571 is a rare tectosilicate sulfate mineral with endmember formula Na 3 Ca(Si 3 Al 3)O 12 (SO 4). [1] As much as 5 wt % K 2 O may be present, and also H 2 O and Cl. It is a feldspathoid and a member of the sodalite group.
Lazulite or Azure spar [6]: 14 is a transparent to semi-opaque, blue mineral that is a phosphate of magnesium, iron, and aluminium, with the chemical formula (Mg,Fe 2+)Al 2 (PO 4) 2 (OH) 2. [3] Lazulite forms one endmember of a solid solution series with the darker, iron-rich scorzalite. [3] [5] Lazulite crystallizes in the monoclinic system.
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