Lulzacite
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| Lulzacite | |
|---|---|
| General | |
| Category | Phosphate minerals |
| Chemical formula | Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10 |
| Strunz classification | 08.BK.25 |
| Identification | |
| Color | Grayish-green to yellowish-green |
| Crystal habit | Anhedral aggregates; rarely small euhedral crystals |
| Crystal system | Triclinic (pinacoidal) |
| Cleavage | None |
| Mohs scale hardness | 5.5–6 |
| Luster | Vitreous |
| Diaphaneity | Transparent–translucent |
| Specific gravity | 3.55 |
| Optical properties | Biaxial (−) |
| Refractive index | nα = 1.654 nβ = 1.674 nγ = 1.684 |
| Birefringence | δ = 0.030 |
| References | [1][2][3] |
Lulzacite is a strontium-containing phosphate mineral with the chemical formula Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10.[1][2]
The mineral was first described in 2000 from quartzite deposits (47°42′50″N 1°29′20″W / 47.71389°N 1.48889°W) at Saint-Aubin-des-Châteaux, Loire-Atlantique, France, and is named after Y. Lulzac, a French geologist who discovered the mineral. In this deposit, lulzacite occurs within quartz and siderite veinlets at quartzite–limestone contacts. Other minerals found in the veinlets include apatite, goyazite, and pyrite.[3]
Lulzacite crystalizes in the triclinic system with P1 space group. It is isostructural with jamesite (Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10).[3][4]
[edit] References
- ^ a b "Lulzacite Mineral Data". webmineral.com. David Barthelmy. http://webmineral.com/data/Lulzacite.shtml. Retrieved September 4, 2010.
- ^ a b "Lulzacite". mindat.org. Jolyon Ralph and Ida Chau. http://www.mindat.org/min-7058.html. Retrieved September 4, 2010.
- ^ a b c Yves Moëlo, Bernard Lasnier, Pierre Palvadeau, Philippe Léone, and François Fontan (15 March 2000). "Lulzacite, Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10, a new strontium phosphate (Saint-Aubin-des-Châteaux, Loire-Atlantique, France).". Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science 330: 317–324. doi:10.1016/S1251-8050(00)00152-X.
- ^ "Jamesite". mindat.org. Jolyon Ralph and Ida Chau. http://www.mindat.org/min-2071.html. Retrieved September 4, 2010.
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