Lazurite
Alumino-silicate mineral whose blue colour is due to a sulfide species and not copper / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about Lazurite?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
Lazurite is a tectosilicate mineral with sulfate, sulfur and chloride with formula (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)]. It is a feldspathoid and a member of the sodalite group. Lazurite crystallizes in the isometric system although well‐formed crystals are rare. It is usually massive and forms the bulk of the gemstone lapis lazuli.
Quick Facts General, Category ...
Lazurite | |
---|---|
General | |
Category | Tectosilicate |
Formula (repeating unit) | (Na,Ca)8[(S,Cl,SO4,OH)2|(Al6Si6O24)] |
IMA symbol | Lzr[1] |
Strunz classification | 9.FB.10 |
Crystal system | Isometric |
Crystal class | Hextetrahedral (43m) H-M symbol: (4 3m) |
Space group | P43n |
Unit cell | a = 9.09 Å; Z = 2 |
Identification | |
Color | Deep blue, azure, violet-blue, greenish blue |
Crystal habit | Crystals occur as dodecahedra, or rarely cubes; granular, disseminated, or massive |
Cleavage | Imperfect on {110} |
Fracture | Uneven |
Tenacity | Brittle |
Mohs scale hardness | 5–5.5 |
Luster | Vitreous |
Diaphaneity | Translucent to opaque |
Specific gravity | 2.38–2.45 |
Optical properties | Isotropic; anomalously anisotropic |
Refractive index | 1.502–1.522 |
Fusibility | 3.5 |
Solubility | Soluble in HCl |
References | [2][3][4][5][6] |
Close