Yagiite
From Wikipedia, the free encyclopedia
Categorycyclosilicates
Crystal systemHexagonal, dipyramidal dihexagonal
| Yagiite | |
|---|---|
| General | |
| Category | cyclosilicates |
| Formula | NaMg2(AlMg2Si12)O30 |
| IMA symbol | Yag[1] |
| Crystal system | Hexagonal, dipyramidal dihexagonal |
| Crystal class | 9.CM.05 (Strunz) |
| Identification | |
| Formula mass | 1991.71 |
| Color | colourless |
| Crystal habit | Interstitial in a silicate inclusion surrounded by nickel-iron |
| Mohs scale hardness | 5 a 6 (Mohs) |
| Lustre | vitreous |
| Diaphaneity | semitransparent |
| Density | 2.70 g/cm3 |
| Pleochroism | low, blue to colourless |
Yagiite is a cyclosilicate mineral belonging to the osumilite group. It was discovered in 1968 in the iron meteorite that fell in Colomera in the province of Granada (Spain). Named after the Japanese mineralogist Kenzo Yagi, its CAS Registry Number is IMA1968-020.
It is an anhydrous aluminosilicate of sodium and magnesium, which crystallizes in the hexagonal crystalline system with silicate tetrahedra arranged in double rings.[2] In addition to the elements of its formula, it usually carries impurities: such as titanium, chromium, iron, manganese and calcium.