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Sodalite (/ˈsoʊ.dəˌlaɪt/ SOH-də-lyte) is a tectosilicate mineral with the formula Na
8(Al
6Si
6O
24)Cl
2, with royal blue varieties widely used as an ornamental gemstone. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. Sodalite is a member of the sodalite group with hauyne, nosean, lazurite and tugtupite.
Quick Facts Sodalite, 基本資料 ...
Sodalite | |
---|---|
基本資料 | |
類別 | Tectosilicates without zeolitic H2O |
化學式 | Na 8(Al 6Si 6O 24)Cl 2 |
IMA記號 | Sdl[1] |
施特龍茨分類 | 9.FB.10 |
晶體分類 | Hextetrahedral (43m) H-M symbol: (4 3m) |
晶體空間群 | P43n |
晶胞 | a = 8.876(6) Å; Z = 1 |
性質 | |
顏色 | Rich royal blue, green, yellow, violet, white veining common |
晶體慣態 | Massive; rarely as dodecahedra |
晶系 | Cubic |
雙晶 | Common on {111} forming pseudohexagonal prisms |
解理 | Poor on {110} |
斷口 | Conchoidal to uneven |
韌性/脆性 | Brittle |
莫氏硬度 | 5.5-6 |
光澤 | Dull vitreous to greasy |
條痕 | White |
透明性 | Transparent to translucent |
比重 | 2.27-2.33 |
光學性質 | Isotropic |
折射率 | n = 1.483 - 1.487 |
發光性 | Bright red-orange cathodoluminescence and fluorescence under LW and SW UV, with yellowish phosphorescence; may be photochromic in magentas |
熔性 | Easily to a colourless glass; sodium yellow flame |
溶解度 | Soluble in hydrochloric acid and nitric acid |
參考文獻 | [2][3][4][5] |
主要品種 | |
Hackmanite | Tenebrescent; violet-red or green fading to white |
Close
First discovered by Europeans in 1811 in the Ilimaussaq intrusive complex in Greenland, sodalite did not become important as an ornamental stone until 1891 when vast deposits of fine material were discovered in Ontario, Canada.