Lulzacite
Lulzacite is a strontium-containing phosphate mineral with the chemical formula Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10.[1][2]
| Lulzacite | |
|---|---|
 Lulzacite found in France | |
| General | |
| Category | Phosphate minerals |
| Formula (repeating unit) | Sr2Fe2+(Fe2+,Mg)2Al4(PO4)4(OH)10 |
| Strunz classification | 8.BK.25 |
| Crystal system | Triclinic |
| Crystal class | Pinacoidal (1) (same H-M symbol) |
| Space group | P1 |
| Identification | |
| Color | Grayish-green to yellowish-green |
| Crystal habit | Anhedral aggregates; rarely small euhedral crystals |
| 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] |
The mineral was first described in 2000 from quartzite deposits (47°42′50″N 1°29′20″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 crystallizes in the triclinic system with P1 space group. It is isostructural with jamesite (Pb2Zn(Fe2+,Zn)2Fe3+4(AsO4)4(OH)10).[3][4]
References
- "Lulzacite Mineral Data". webmineral.com. David Barthelmy. Retrieved September 4, 2010.
- "Lulzacite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010.
- Moëlo, Yves; Bernard Lasnier; Pierre Palvadeau; Philippe Léone; 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'Académie des Sciences, Série IIA. 330: 317–324. Bibcode:2000CRASE.330..317M. doi:10.1016/S1251-8050(00)00152-X.
- "Jamesite". mindat.org. Jolyon Ralph and Ida Chau. Retrieved September 4, 2010.
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